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/*
* 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>
#include <asm/ptrace.h>
/*
s390 specific smp.c headers
*/
typedef struct
{
int intresting;
sigp_ccode ccode;
__u32 status;
__u16 cpu;
} sigp_info;
extern void machine_restart_smp(char *);
extern void machine_halt_smp(void);
extern void machine_power_off_smp(void);
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 volatile("stap %0" : "=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;
}
static inline void smp_send_stop(void)
{
/* Disable all interrupts/machine checks */
__load_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK);
}
#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() do { } while (0)
#endif
#endif
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