cregit-Linux how code gets into the kernel

Release 4.14 arch/powerpc/include/asm/smp.h

/* 
 * smp.h: PowerPC-specific SMP code.
 *
 * Original was a copy of sparc smp.h.  Now heavily modified
 * for PPC.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1996-2001 Cort Dougan <cort@fsmlabs.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifndef _ASM_POWERPC_SMP_H

#define _ASM_POWERPC_SMP_H
#ifdef __KERNEL__

#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/kernel.h>
#include <linux/irqreturn.h>

#ifndef __ASSEMBLY__

#ifdef CONFIG_PPC64
#include <asm/paca.h>
#endif
#include <asm/percpu.h>

extern int boot_cpuid;
extern int spinning_secondaries;

extern void cpu_die(void);
extern int cpu_to_chip_id(int cpu);

#ifdef CONFIG_SMP


struct smp_ops_t {
	
void  (*message_pass)(int cpu, int msg);
#ifdef CONFIG_PPC_SMP_MUXED_IPI
	
void  (*cause_ipi)(int cpu);
#endif
	
int   (*cause_nmi_ipi)(int cpu);
	
void  (*probe)(void);
	
int   (*kick_cpu)(int nr);
	
int   (*prepare_cpu)(int nr);
	
void  (*setup_cpu)(int nr);
	
void  (*bringup_done)(void);
	
void  (*take_timebase)(void);
	
void  (*give_timebase)(void);
	
int   (*cpu_disable)(void);
	
void  (*cpu_die)(unsigned int nr);
	
int   (*cpu_bootable)(unsigned int nr);
};

extern void smp_flush_nmi_ipi(u64 delay_us);
extern int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us);
extern void smp_send_debugger_break(void);
extern void start_secondary_resume(void);
extern void smp_generic_give_timebase(void);
extern void smp_generic_take_timebase(void);

DECLARE_PER_CPU(unsigned int, cpu_pvr);

#ifdef CONFIG_HOTPLUG_CPU
int generic_cpu_disable(void);
void generic_cpu_die(unsigned int cpu);
void generic_set_cpu_dead(unsigned int cpu);
void generic_set_cpu_up(unsigned int cpu);
int generic_check_cpu_restart(unsigned int cpu);
int is_cpu_dead(unsigned int cpu);
#else

#define generic_set_cpu_up(i)	do { } while (0)
#endif

#ifdef CONFIG_PPC64

#define raw_smp_processor_id()	(local_paca->paca_index)

#define hard_smp_processor_id() (get_paca()->hw_cpu_id)
#else
/* 32-bit */
extern int smp_hw_index[];


#define raw_smp_processor_id()	(current_thread_info()->cpu)

#define hard_smp_processor_id() 	(smp_hw_index[smp_processor_id()])


static inline int get_hard_smp_processor_id(int cpu) { return smp_hw_index[cpu]; }

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Paul Mackerras425.00%150.00%
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static inline void set_hard_smp_processor_id(int cpu, int phys) { smp_hw_index[cpu] = phys; }

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Benjamin Herrenschmidt1470.00%150.00%
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#endif DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_map); DECLARE_PER_CPU(cpumask_var_t, cpu_l2_cache_map); DECLARE_PER_CPU(cpumask_var_t, cpu_core_map);
static inline struct cpumask *cpu_sibling_mask(int cpu) { return per_cpu(cpu_sibling_map, cpu); }

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static inline struct cpumask *cpu_core_mask(int cpu) { return per_cpu(cpu_core_map, cpu); }

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static inline struct cpumask *cpu_l2_cache_mask(int cpu) { return per_cpu(cpu_l2_cache_map, cpu); }

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Oliver O'Halloran20100.00%1100.00%
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extern int cpu_to_core_id(int cpu); /* Since OpenPIC has only 4 IPIs, we use slightly different message numbers. * * Make sure this matches openpic_request_IPIs in open_pic.c, or what shows up * in /proc/interrupts will be wrong!!! --Troy */ #define PPC_MSG_CALL_FUNCTION 0 #define PPC_MSG_RESCHEDULE 1 #define PPC_MSG_TICK_BROADCAST 2 #define PPC_MSG_NMI_IPI 3 /* This is only used by the powernv kernel */ #define PPC_MSG_RM_HOST_ACTION 4 #define NMI_IPI_ALL_OTHERS -2 #ifdef CONFIG_NMI_IPI extern int smp_handle_nmi_ipi(struct pt_regs *regs); #else
static inline int smp_handle_nmi_ipi(struct pt_regs *regs) { return 0; }

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Nicholas Piggin15100.00%1100.00%
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#endif /* for irq controllers that have dedicated ipis per message (4) */ extern int smp_request_message_ipi(int virq, int message); extern const char *smp_ipi_name[]; /* for irq controllers with only a single ipi */ extern void smp_muxed_ipi_message_pass(int cpu, int msg); extern void smp_muxed_ipi_set_message(int cpu, int msg); extern irqreturn_t smp_ipi_demux(void); extern irqreturn_t smp_ipi_demux_relaxed(void); void smp_init_pSeries(void); void smp_init_cell(void); void smp_setup_cpu_maps(void); extern int __cpu_disable(void); extern void __cpu_die(unsigned int cpu); #else /* for UP */ #define hard_smp_processor_id() get_hard_smp_processor_id(0) #define smp_setup_cpu_maps()
static inline void inhibit_secondary_onlining(void) {}

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static inline void uninhibit_secondary_onlining(void) {}

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static inline const struct cpumask *cpu_sibling_mask(int cpu) { return cpumask_of(cpu); }

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#endif /* CONFIG_SMP */ #ifdef CONFIG_PPC64
static inline int get_hard_smp_processor_id(int cpu) { return paca[cpu].hw_cpu_id; }

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Benjamin Herrenschmidt1583.33%150.00%
Andrew Morton316.67%150.00%
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static inline void set_hard_smp_processor_id(int cpu, int phys) { paca[cpu].hw_cpu_id = phys; }

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Andrew Morton418.18%150.00%
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#else /* 32-bit */ #ifndef CONFIG_SMP extern int boot_cpuid_phys;
static inline int get_hard_smp_processor_id(int cpu) { return boot_cpuid_phys; }

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Benjamin Herrenschmidt969.23%150.00%
Paul Mackerras430.77%150.00%
Total13100.00%2100.00%


static inline void set_hard_smp_processor_id(int cpu, int phys) { boot_cpuid_phys = phys; }

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Paul Mackerras635.29%133.33%
Kumar Gala635.29%133.33%
Benjamin Herrenschmidt529.41%133.33%
Total17100.00%3100.00%

#endif /* !CONFIG_SMP */ #endif /* !CONFIG_PPC64 */ #if defined(CONFIG_PPC64) && (defined(CONFIG_SMP) || defined(CONFIG_KEXEC_CORE)) extern void smp_release_cpus(void); #else
static inline void smp_release_cpus(void) { }

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Benjamin Herrenschmidt8100.00%1100.00%
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; #endif extern int smt_enabled_at_boot; extern void smp_mpic_probe(void); extern void smp_mpic_setup_cpu(int cpu); extern int smp_generic_kick_cpu(int nr); extern int smp_generic_cpu_bootable(unsigned int nr); extern void smp_generic_give_timebase(void); extern void smp_generic_take_timebase(void); extern struct smp_ops_t *smp_ops; extern void arch_send_call_function_single_ipi(int cpu); extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); /* Definitions relative to the secondary CPU spin loop * and entry point. Not all of them exist on both 32 and * 64-bit but defining them all here doesn't harm */ extern void generic_secondary_smp_init(void); extern void generic_secondary_thread_init(void); extern unsigned long __secondary_hold_spinloop; extern unsigned long __secondary_hold_acknowledge; extern char __secondary_hold; extern unsigned int booting_thread_hwid; extern void __early_start(void); #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_SMP_H) */

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Benjamin Herrenschmidt22624.17%1320.31%
Milton D. Miller II17518.72%57.81%
Anton Blanchard10411.12%69.38%
Paul Mackerras9810.48%23.12%
Nicholas Piggin848.98%46.25%
Chen-Hui Zhao373.96%46.25%
Andrew Morton363.85%46.25%
Oliver O'Halloran272.89%11.56%
Zwane Mwaikambo212.25%11.56%
Robert Jennings192.03%11.56%
Michael Ellerman171.82%46.25%
Suresh E. Warrier161.71%23.12%
Jens Axboe141.50%11.56%
Nathan T. Lynch141.50%23.12%
Andy Fleming90.96%11.56%
Mike Travis80.86%11.56%
Kumar Gala70.75%11.56%
Arnd Bergmann60.64%11.56%
Rusty Russell50.53%11.56%
Fernando Luis Vázquez Cao40.43%11.56%
Srivatsa S. Bhat10.11%11.56%
Matt Evans10.11%11.56%
David Gibson10.11%11.56%
Thiago Jung Bauermann10.11%11.56%
Hugh Dickins10.11%11.56%
Tejun Heo10.11%11.56%
Matthew Dobson10.11%11.56%
Ingo Molnar10.11%11.56%
Total935100.00%64100.00%
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