mirror of
https://github.com/torvalds/linux.git
synced 2025-11-01 00:58:39 +02:00
d2912cb15b
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
|
*/
|
|
|
|
#ifndef __ASM_ARC_SMP_H
|
|
#define __ASM_ARC_SMP_H
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/threads.h>
|
|
|
|
#define raw_smp_processor_id() (current_thread_info()->cpu)
|
|
|
|
/* including cpumask.h leads to cyclic deps hence this Forward declaration */
|
|
struct cpumask;
|
|
|
|
/*
|
|
* APIs provided by arch SMP code to generic code
|
|
*/
|
|
extern void arch_send_call_function_single_ipi(int cpu);
|
|
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
|
|
|
|
/*
|
|
* APIs provided by arch SMP code to rest of arch code
|
|
*/
|
|
extern void __init smp_init_cpus(void);
|
|
extern void first_lines_of_secondary(void);
|
|
extern const char *arc_platform_smp_cpuinfo(void);
|
|
|
|
/*
|
|
* API expected BY platform smp code (FROM arch smp code)
|
|
*
|
|
* smp_ipi_irq_setup:
|
|
* Takes @cpu and @hwirq to which the arch-common ISR is hooked up
|
|
*/
|
|
extern int smp_ipi_irq_setup(int cpu, irq_hw_number_t hwirq);
|
|
|
|
/*
|
|
* struct plat_smp_ops - SMP callbacks provided by platform to ARC SMP
|
|
*
|
|
* @info: SoC SMP specific info for /proc/cpuinfo etc
|
|
* @init_early_smp: A SMP specific h/w block can init itself
|
|
* Could be common across platforms so not covered by
|
|
* mach_desc->init_early()
|
|
* @init_per_cpu: Called for each core so SMP h/w block driver can do
|
|
* any needed setup per cpu (e.g. IPI request)
|
|
* @cpu_kick: For Master to kickstart a cpu (optionally at a PC)
|
|
* @ipi_send: To send IPI to a @cpu
|
|
* @ips_clear: To clear IPI received at @irq
|
|
*/
|
|
struct plat_smp_ops {
|
|
const char *info;
|
|
void (*init_early_smp)(void);
|
|
void (*init_per_cpu)(int cpu);
|
|
void (*cpu_kick)(int cpu, unsigned long pc);
|
|
void (*ipi_send)(int cpu);
|
|
void (*ipi_clear)(int irq);
|
|
};
|
|
|
|
/* TBD: stop exporting it for direct population by platform */
|
|
extern struct plat_smp_ops plat_smp_ops;
|
|
|
|
#else /* CONFIG_SMP */
|
|
|
|
static inline void smp_init_cpus(void) {}
|
|
static inline const char *arc_platform_smp_cpuinfo(void)
|
|
{
|
|
return "";
|
|
}
|
|
|
|
#endif /* !CONFIG_SMP */
|
|
|
|
/*
|
|
* ARC700 doesn't support atomic Read-Modify-Write ops.
|
|
* Originally Interrupts had to be disabled around code to gaurantee atomicity.
|
|
* The LLOCK/SCOND insns allow writing interrupt-hassle-free based atomic ops
|
|
* based on retry-if-irq-in-atomic (with hardware assist).
|
|
* However despite these, we provide the IRQ disabling variant
|
|
*
|
|
* (1) These insn were introduced only in 4.10 release. So for older released
|
|
* support needed.
|
|
*
|
|
* (2) In a SMP setup, the LLOCK/SCOND atomicity across CPUs needs to be
|
|
* gaurantted by the platform (not something which core handles).
|
|
* Assuming a platform won't, SMP Linux needs to use spinlocks + local IRQ
|
|
* disabling for atomicity.
|
|
*
|
|
* However exported spinlock API is not usable due to cyclic hdr deps
|
|
* (even after system.h disintegration upstream)
|
|
* asm/bitops.h -> linux/spinlock.h -> linux/preempt.h
|
|
* -> linux/thread_info.h -> linux/bitops.h -> asm/bitops.h
|
|
*
|
|
* So the workaround is to use the lowest level arch spinlock API.
|
|
* The exported spinlock API is smart enough to be NOP for !CONFIG_SMP,
|
|
* but same is not true for ARCH backend, hence the need for 2 variants
|
|
*/
|
|
#ifndef CONFIG_ARC_HAS_LLSC
|
|
|
|
#include <linux/irqflags.h>
|
|
#ifdef CONFIG_SMP
|
|
|
|
#include <asm/spinlock.h>
|
|
|
|
extern arch_spinlock_t smp_atomic_ops_lock;
|
|
extern arch_spinlock_t smp_bitops_lock;
|
|
|
|
#define atomic_ops_lock(flags) do { \
|
|
local_irq_save(flags); \
|
|
arch_spin_lock(&smp_atomic_ops_lock); \
|
|
} while (0)
|
|
|
|
#define atomic_ops_unlock(flags) do { \
|
|
arch_spin_unlock(&smp_atomic_ops_lock); \
|
|
local_irq_restore(flags); \
|
|
} while (0)
|
|
|
|
#define bitops_lock(flags) do { \
|
|
local_irq_save(flags); \
|
|
arch_spin_lock(&smp_bitops_lock); \
|
|
} while (0)
|
|
|
|
#define bitops_unlock(flags) do { \
|
|
arch_spin_unlock(&smp_bitops_lock); \
|
|
local_irq_restore(flags); \
|
|
} while (0)
|
|
|
|
#else /* !CONFIG_SMP */
|
|
|
|
#define atomic_ops_lock(flags) local_irq_save(flags)
|
|
#define atomic_ops_unlock(flags) local_irq_restore(flags)
|
|
|
|
#define bitops_lock(flags) local_irq_save(flags)
|
|
#define bitops_unlock(flags) local_irq_restore(flags)
|
|
|
|
#endif /* !CONFIG_SMP */
|
|
|
|
#endif /* !CONFIG_ARC_HAS_LLSC */
|
|
|
|
#endif
|