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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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39b083fe1c
Use do { } while (0) constructs instead of empty defines to avoid
subtle compile bugs.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*
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* include/asm-s390/smp.h
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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* Heiko Carstens (heiko.carstens@de.ibm.com)
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*/
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#ifndef __ASM_SMP_H
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#define __ASM_SMP_H
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/bitops.h>
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#if defined(__KERNEL__) && defined(CONFIG_SMP) && !defined(__ASSEMBLY__)
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#include <asm/lowcore.h>
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#include <asm/sigp.h>
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/*
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s390 specific smp.c headers
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*/
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typedef struct
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{
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int intresting;
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sigp_ccode ccode;
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__u32 status;
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__u16 cpu;
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} sigp_info;
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extern void smp_setup_cpu_possible_map(void);
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extern int smp_call_function_on(void (*func) (void *info), void *info,
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int nonatomic, int wait, int cpu);
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#define NO_PROC_ID 0xFF /* No processor magic marker */
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/*
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* This magic constant controls our willingness to transfer
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* a process across CPUs. Such a transfer incurs misses on the L1
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* cache, and on a P6 or P5 with multiple L2 caches L2 hits. My
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* gut feeling is this will vary by board in value. For a board
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* with separate L2 cache it probably depends also on the RSS, and
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* for a board with shared L2 cache it ought to decay fast as other
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* processes are run.
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*/
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#define PROC_CHANGE_PENALTY 20 /* Schedule penalty */
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#define raw_smp_processor_id() (S390_lowcore.cpu_data.cpu_nr)
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extern int smp_get_cpu(cpumask_t cpu_map);
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extern void smp_put_cpu(int cpu);
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static inline __u16 hard_smp_processor_id(void)
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{
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__u16 cpu_address;
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__asm__ ("stap %0\n" : "=m" (cpu_address));
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return cpu_address;
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}
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/*
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* returns 1 if cpu is in stopped/check stopped state or not operational
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* returns 0 otherwise
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*/
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static inline int
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smp_cpu_not_running(int cpu)
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{
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__u32 status;
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switch (signal_processor_ps(&status, 0, cpu, sigp_sense)) {
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case sigp_order_code_accepted:
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case sigp_status_stored:
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/* Check for stopped and check stop state */
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if (status & 0x50)
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return 1;
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break;
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case sigp_not_operational:
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return 1;
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default:
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break;
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}
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return 0;
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}
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#define cpu_logical_map(cpu) (cpu)
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extern int __cpu_disable (void);
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extern void __cpu_die (unsigned int cpu);
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extern void cpu_die (void) __attribute__ ((noreturn));
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extern int __cpu_up (unsigned int cpu);
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#endif
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#ifndef CONFIG_SMP
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static inline int
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smp_call_function_on(void (*func) (void *info), void *info,
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int nonatomic, int wait, int cpu)
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{
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func(info);
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return 0;
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}
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#define smp_cpu_not_running(cpu) 1
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#define smp_get_cpu(cpu) ({ 0; })
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#define smp_put_cpu(cpu) ({ 0; })
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#define smp_setup_cpu_possible_map() do { } while (0)
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#endif
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#endif
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