111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/*
|
|
* include/asm-s390/smp.h
|
|
*
|
|
* S390 version
|
|
* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
|
|
* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
|
|
* Martin Schwidefsky (schwidefsky@de.ibm.com)
|
|
* Heiko Carstens (heiko.carstens@de.ibm.com)
|
|
*/
|
|
#ifndef __ASM_SMP_H
|
|
#define __ASM_SMP_H
|
|
|
|
#include <linux/threads.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#if defined(__KERNEL__) && defined(CONFIG_SMP) && !defined(__ASSEMBLY__)
|
|
|
|
#include <asm/lowcore.h>
|
|
#include <asm/sigp.h>
|
|
|
|
/*
|
|
s390 specific smp.c headers
|
|
*/
|
|
typedef struct
|
|
{
|
|
int intresting;
|
|
sigp_ccode ccode;
|
|
__u32 status;
|
|
__u16 cpu;
|
|
} sigp_info;
|
|
|
|
extern void smp_setup_cpu_possible_map(void);
|
|
extern int smp_call_function_on(void (*func) (void *info), void *info,
|
|
int nonatomic, int wait, int cpu);
|
|
#define NO_PROC_ID 0xFF /* No processor magic marker */
|
|
|
|
/*
|
|
* This magic constant controls our willingness to transfer
|
|
* a process across CPUs. Such a transfer incurs misses on the L1
|
|
* cache, and on a P6 or P5 with multiple L2 caches L2 hits. My
|
|
* gut feeling is this will vary by board in value. For a board
|
|
* with separate L2 cache it probably depends also on the RSS, and
|
|
* for a board with shared L2 cache it ought to decay fast as other
|
|
* processes are run.
|
|
*/
|
|
|
|
#define PROC_CHANGE_PENALTY 20 /* Schedule penalty */
|
|
|
|
#define raw_smp_processor_id() (S390_lowcore.cpu_data.cpu_nr)
|
|
|
|
extern int smp_get_cpu(cpumask_t cpu_map);
|
|
extern void smp_put_cpu(int cpu);
|
|
|
|
static inline __u16 hard_smp_processor_id(void)
|
|
{
|
|
__u16 cpu_address;
|
|
|
|
__asm__ ("stap %0\n" : "=m" (cpu_address));
|
|
return cpu_address;
|
|
}
|
|
|
|
/*
|
|
* returns 1 if cpu is in stopped/check stopped state or not operational
|
|
* returns 0 otherwise
|
|
*/
|
|
static inline int
|
|
smp_cpu_not_running(int cpu)
|
|
{
|
|
__u32 status;
|
|
|
|
switch (signal_processor_ps(&status, 0, cpu, sigp_sense)) {
|
|
case sigp_order_code_accepted:
|
|
case sigp_status_stored:
|
|
/* Check for stopped and check stop state */
|
|
if (status & 0x50)
|
|
return 1;
|
|
break;
|
|
case sigp_not_operational:
|
|
return 1;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#define cpu_logical_map(cpu) (cpu)
|
|
|
|
extern int __cpu_disable (void);
|
|
extern void __cpu_die (unsigned int cpu);
|
|
extern void cpu_die (void) __attribute__ ((noreturn));
|
|
extern int __cpu_up (unsigned int cpu);
|
|
|
|
#endif
|
|
|
|
#ifndef CONFIG_SMP
|
|
static inline int
|
|
smp_call_function_on(void (*func) (void *info), void *info,
|
|
int nonatomic, int wait, int cpu)
|
|
{
|
|
func(info);
|
|
return 0;
|
|
}
|
|
#define smp_cpu_not_running(cpu) 1
|
|
#define smp_get_cpu(cpu) ({ 0; })
|
|
#define smp_put_cpu(cpu) ({ 0; })
|
|
#define smp_setup_cpu_possible_map()
|
|
#endif
|
|
|
|
#endif
|