10ad34bc76
The multi-threading facility is introduced with the z13 processor family. This patch adds code to detect the multi-threading facility. With the facility enabled each core will surface multiple hardware threads to the system. Each hardware threads looks like a normal CPU to the operating system with all its registers and properties. The SCLP interface reports the SMT topology indirectly via the maximum thread id. Each reported CPU in the result of a read-scp-information is a core representing a number of hardware threads. To reflect the reduced CPU capacity if two hardware threads run on a single core the MT utilization counter set is used to normalize the raw cputime obtained by the CPU timer deltas. This scaled cputime is reported via the taskstats interface. The normal /proc/stat numbers are based on the raw cputime and are not affected by the normalization. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
81 lines
2 KiB
C
81 lines
2 KiB
C
/*
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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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* 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 <asm/sigp.h>
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#ifdef CONFIG_SMP
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#include <asm/lowcore.h>
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#define raw_smp_processor_id() (S390_lowcore.cpu_nr)
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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 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_online_cpu(void (*func)(void *), void *);
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extern void smp_call_ipl_cpu(void (*func)(void *), 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 int smp_vcpu_scheduled(int cpu);
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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_fill_possible_mask(void);
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#else /* CONFIG_SMP */
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#define smp_cpu_mtid 0
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static inline void smp_call_ipl_cpu(void (*func)(void *), void *data)
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{
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func(data);
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}
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static inline void smp_call_online_cpu(void (*func)(void *), void *data)
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{
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func(data);
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}
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static inline int smp_find_processor_id(u16 address) { return 0; }
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static inline int smp_store_status(int cpu) { return 0; }
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static inline int smp_vcpu_scheduled(int cpu) { return 1; }
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static inline void smp_yield_cpu(int cpu) { }
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static inline void smp_fill_possible_mask(void) { }
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#endif /* CONFIG_SMP */
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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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#ifdef CONFIG_HOTPLUG_CPU
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extern int smp_rescan_cpus(void);
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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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#else
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static inline int smp_rescan_cpus(void) { return 0; }
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static inline void cpu_die(void) { }
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#endif
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#endif /* __ASM_SMP_H */
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