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26ceef523d
Linux scheduler allows architectures to assign capacity values to individual CPUs. This hints scheduler the performance difference between CPUs and allows more efficient task distribution them. Implement helper methods to set and get CPU capacities for s390. This is particularly helpful in vertical polarization configurations of LPARs. On vertical polarization an LPARs CPUs can get different polarization values depending on the CEC configuration. CPUs with different polarization values can perform different from each other, using CPU capacities this can be reflected to linux scheduler. Acked-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Mete Durlu <meted@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright IBM Corp. 1999, 2012
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* Author(s): Denis Joseph Barrow,
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* Martin Schwidefsky <schwidefsky@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 <asm/sigp.h>
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#include <asm/lowcore.h>
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#include <asm/processor.h>
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#define raw_smp_processor_id() (get_lowcore()->cpu_nr)
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#define arch_scale_cpu_capacity smp_cpu_get_capacity
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extern struct mutex smp_cpu_state_mutex;
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extern unsigned int smp_cpu_mt_shift;
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extern unsigned int smp_cpu_mtid;
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extern __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];
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extern cpumask_t cpu_setup_mask;
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extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
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extern void arch_send_call_function_single_ipi(int cpu);
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extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
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extern void smp_call_ipl_cpu(void (*func)(void *), void *);
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extern void smp_emergency_stop(void);
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extern int smp_find_processor_id(u16 address);
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extern int smp_store_status(int cpu);
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extern void smp_save_dump_ipl_cpu(void);
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extern void smp_save_dump_secondary_cpus(void);
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extern void smp_yield_cpu(int cpu);
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extern void smp_cpu_set_polarization(int cpu, int val);
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extern int smp_cpu_get_polarization(int cpu);
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extern void smp_cpu_set_capacity(int cpu, unsigned long val);
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extern void smp_set_core_capacity(int cpu, unsigned long val);
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extern unsigned long smp_cpu_get_capacity(int cpu);
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extern int smp_cpu_get_cpu_address(int cpu);
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extern void smp_fill_possible_mask(void);
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extern void smp_detect_cpus(void);
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static inline void smp_stop_cpu(void)
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{
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u16 pcpu = stap();
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for (;;) {
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__pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
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cpu_relax();
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}
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}
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/* Return thread 0 CPU number as base CPU */
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static inline int smp_get_base_cpu(int cpu)
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{
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return cpu - (cpu % (smp_cpu_mtid + 1));
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}
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static inline void smp_cpus_done(unsigned int max_cpus)
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{
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}
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extern int smp_rescan_cpus(bool early);
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extern void __noreturn cpu_die(void);
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extern void __cpu_die(unsigned int cpu);
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extern int __cpu_disable(void);
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extern void schedule_mcck_handler(void);
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void notrace smp_yield_cpu(int cpu);
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#endif /* __ASM_SMP_H */
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