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/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* 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.
*/
#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 __init first_lines_of_secondary(void);
/*
* API expected BY platform smp code (FROM arch smp code)
*
* smp_ipi_irq_setup:
* Takes @cpu and @irq to which the arch-common ISR is hooked up
*/
extern int smp_ipi_irq_setup(int cpu, int irq);
/*
* APIs expected FROM platform smp code
*
* arc_platform_smp_cpuinfo:
* returns a string containing info for /proc/cpuinfo
*
* arc_platform_smp_init_cpu:
* Called from start_kernel_secondary to do any CPU local setup
* such as starting a timer, setting up IPI etc
*
* arc_platform_smp_wait_to_boot:
* Called from early bootup code for non-Master CPUs to "park" them
*
* arc_platform_smp_wakeup_cpu:
* Called from __cpu_up (Master CPU) to kick start another one
*
* arc_platform_ipi_send:
* Takes @cpumask to which IPI(s) would be sent.
* The actual msg-id/buffer is manager in arch-common code
*
* arc_platform_ipi_clear:
* Takes @cpu which got IPI at @irq to do any IPI clearing
*/
extern const char *arc_platform_smp_cpuinfo(void);
extern void arc_platform_smp_init_cpu(void);
extern void arc_platform_smp_wait_to_boot(int cpu);
extern void arc_platform_smp_wakeup_cpu(int cpu, unsigned long pc);
extern void arc_platform_ipi_send(const struct cpumask *callmap);
extern void arc_platform_ipi_clear(int cpu, int irq);
#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 atomiticity 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
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