mirror of
https://github.com/torvalds/linux
synced 2024-09-27 23:10:58 +00:00
8b646bd759
Define struct pcpu and merge some of the NR_CPUS arrays into it, including __cpu_logical_map, current_set and smp_cpu_state. Split smp related functions to those operating on physical cpus and the functions operating on a logical cpu number. Make the functions for physical cpus use a pointer to a struct pcpu. This hides the knowledge about cpu addresses in smp.c, entry[64].S and swsusp_asm64.S, thus remove the sigp.h header. The PSW restart mechanism is used to start secondary cpus, calling a function on an online cpu, calling a function on the ipl cpu, and for the nmi signal. Replace the different assembler functions with a single function restart_int_handler. The new entry point calls a function whose pointer is stored in the lowcore of the target cpu and it can wait for the source cpu to stop. This covers all existing use cases. Overall the code is now simpler and there are ~380 lines less code. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
|
|
* 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
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
#include <asm/system.h>
|
|
|
|
#define raw_smp_processor_id() (S390_lowcore.cpu_nr)
|
|
|
|
extern struct mutex smp_cpu_state_mutex;
|
|
extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
|
|
|
|
extern int __cpu_up(unsigned int cpu);
|
|
|
|
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 int smp_find_processor_id(u16 address);
|
|
extern int smp_store_status(int cpu);
|
|
extern int smp_vcpu_scheduled(int cpu);
|
|
extern void smp_yield_cpu(int cpu);
|
|
extern void smp_yield(void);
|
|
extern void smp_stop_cpu(void);
|
|
|
|
#else /* CONFIG_SMP */
|
|
|
|
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 int smp_find_processor_id(int address) { return 0; }
|
|
static inline int smp_vcpu_scheduled(int cpu) { return 1; }
|
|
static inline void smp_yield_cpu(int cpu) { }
|
|
static inline void smp_yield(void) { }
|
|
static inline void smp_stop_cpu(void) { }
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#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 */
|