forked from mirrors/linux
96cb8ae28c
Provide a generic smt parameters interface aligned with s390 to allow users to limit smt usage and threads per core. It replaced previous undocumented "nothreads" parameter for smp-cps which is ambiguous and does not cover smp-mt. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*
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* Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
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* Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
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* Copyright (C) 2000, 2001, 2002 Ralf Baechle
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* Copyright (C) 2000, 2001 Broadcom Corporation
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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/bitops.h>
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#include <linux/linkage.h>
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#include <linux/smp.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/atomic.h>
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#include <asm/smp-ops.h>
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extern int smp_num_siblings;
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extern cpumask_t cpu_sibling_map[];
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extern cpumask_t cpu_core_map[];
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extern cpumask_t cpu_foreign_map[];
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static inline int raw_smp_processor_id(void)
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{
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#if defined(__VDSO__)
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extern int vdso_smp_processor_id(void)
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__compiletime_error("VDSO should not call smp_processor_id()");
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return vdso_smp_processor_id();
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#else
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return current_thread_info()->cpu;
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#endif
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}
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#define raw_smp_processor_id raw_smp_processor_id
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/* Map from cpu id to sequential logical cpu number. This will only
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not be idempotent when cpus failed to come on-line. */
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extern int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP];
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#define cpu_number_map(cpu) __cpu_number_map[cpu]
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/* The reverse map from sequential logical cpu number to cpu id. */
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extern int __cpu_logical_map[NR_CPUS];
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#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
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#define NO_PROC_ID (-1)
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#define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */
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#define SMP_CALL_FUNCTION 0x2
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/* Octeon - Tell another core to flush its icache */
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#define SMP_ICACHE_FLUSH 0x4
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#define SMP_ASK_C0COUNT 0x8
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/* Mask of CPUs which are currently definitely operating coherently */
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extern cpumask_t cpu_coherent_mask;
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extern unsigned int smp_max_threads __initdata;
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extern asmlinkage void smp_bootstrap(void);
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extern void calculate_cpu_foreign_map(void);
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/*
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* this function sends a 'reschedule' IPI to another CPU.
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* it goes straight through and wastes no time serializing
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* anything. Worst case is that we lose a reschedule ...
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*/
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static inline void arch_smp_send_reschedule(int cpu)
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{
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extern const struct plat_smp_ops *mp_ops; /* private */
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mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF);
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static inline int __cpu_disable(void)
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{
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extern const struct plat_smp_ops *mp_ops; /* private */
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return mp_ops->cpu_disable();
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}
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static inline void __cpu_die(unsigned int cpu)
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{
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extern const struct plat_smp_ops *mp_ops; /* private */
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mp_ops->cpu_die(cpu);
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}
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extern void __noreturn play_dead(void);
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#endif
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#ifdef CONFIG_KEXEC
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static inline void kexec_nonboot_cpu(void)
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{
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extern const struct plat_smp_ops *mp_ops; /* private */
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return mp_ops->kexec_nonboot_cpu();
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}
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static inline void *kexec_nonboot_cpu_func(void)
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{
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extern const struct plat_smp_ops *mp_ops; /* private */
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return mp_ops->kexec_nonboot_cpu;
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}
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#endif
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/*
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* This function will set up the necessary IPIs for Linux to communicate
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* with the CPUs in mask.
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* Return 0 on success.
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*/
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int mips_smp_ipi_allocate(const struct cpumask *mask);
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/*
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* This function will free up IPIs allocated with mips_smp_ipi_allocate to the
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* CPUs in mask, which must be a subset of the IPIs that have been configured.
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* Return 0 on success.
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*/
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int mips_smp_ipi_free(const struct cpumask *mask);
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static inline void arch_send_call_function_single_ipi(int cpu)
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{
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extern const struct plat_smp_ops *mp_ops; /* private */
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mp_ops->send_ipi_single(cpu, SMP_CALL_FUNCTION);
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}
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static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
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{
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extern const struct plat_smp_ops *mp_ops; /* private */
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mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
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}
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#endif /* __ASM_SMP_H */
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