FM / asm

/usr/src/linux-headers-5.15.0-190/arch/arc/include/asm/

/usr/src/linux-headers-5.15.0-190/arch/arc/include/asm

Name	Size	Mode	Actions
arcregs.h	9477	0644	edit dl rm
asm-offsets.h	165	0644	edit dl rm
asserts.h	958	0644	edit dl rm
atomic-llsc.h	2864	0644	edit dl rm
atomic-spinlock.h	2569	0644	edit dl rm
atomic.h	1153	0644	edit dl rm
atomic64-arcv2.h	6095	0644	edit dl rm
barrier.h	1376	0644	edit dl rm
bitops.h	3885	0644	edit dl rm
bug.h	819	0644	edit dl rm
cache.h	3604	0644	edit dl rm
cacheflush.h	3824	0644	edit dl rm
checksum.h	2371	0644	edit dl rm
cmpxchg.h	3188	0644	edit dl rm
current.h	549	0644	edit dl rm
delay.h	1896	0644	edit dl rm
disasm.h	3813	0644	edit dl rm
dma.h	313	0644	edit dl rm
dsp-impl.h	3860	0644	edit dl rm
dsp.h	796	0644	edit dl rm
dwarf.h	746	0644	edit dl rm
elf.h	1935	0644	edit dl rm
entry-arcv2.h	7419	0644	edit dl rm
entry-compact.h	8810	0644	edit dl rm
entry.h	6687	0644	edit dl rm
exec.h	264	0644	edit dl rm
fb.h	411	0644	edit dl rm
fpu.h	1125	0644	edit dl rm
futex.h	3611	0644	edit dl rm
highmem.h	1422	0644	edit dl rm
hugepage.h	2071	0644	edit dl rm
io.h	6291	0644	edit dl rm
irq.h	679	0644	edit dl rm
irqflags-arcv2.h	3491	0644	edit dl rm
irqflags-compact.h	4293	0644	edit dl rm
irqflags.h	363	0644	edit dl rm
jump_label.h	1976	0644	edit dl rm
Kbuild	153	0644	edit dl rm
kdebug.h	254	0644	edit dl rm
kgdb.h	1239	0644	edit dl rm
kprobes.h	1186	0644	edit dl rm
linkage.h	1484	0644	edit dl rm
mach_desc.h	1943	0644	edit dl rm
mmu-arcv2.h	2494	0644	edit dl rm
mmu.h	387	0644	edit dl rm
mmu_context.h	5568	0644	edit dl rm
module.h	428	0644	edit dl rm
page.h	3313	0644	edit dl rm
pci.h	360	0644	edit dl rm
perf_event.h	6879	0644	edit dl rm
pgalloc.h	2888	0644	edit dl rm
pgtable-bits-arcv2.h	4896	0644	edit dl rm
pgtable-levels.h	5626	0644	edit dl rm
pgtable.h	780	0644	edit dl rm
processor.h	3253	0644	edit dl rm
ptrace.h	3759	0644	edit dl rm
sections.h	261	0644	edit dl rm
segment.h	476	0644	edit dl rm
serial.h	498	0644	edit dl rm
setup.h	1274	0644	edit dl rm
shmparam.h	296	0644	edit dl rm
smp.h	3823	0644	edit dl rm
spinlock.h	8580	0644	edit dl rm
spinlock_types.h	905	0644	edit dl rm
stacktrace.h	1178	0644	edit dl rm
string.h	1036	0644	edit dl rm
switch_to.h	553	0644	edit dl rm
syscall.h	1738	0644	edit dl rm
syscalls.h	547	0644	edit dl rm
thread_info.h	3339	0644	edit dl rm
timex.h	362	0644	edit dl rm
tlb.h	262	0644	edit dl rm
tlbflush.h	1654	0644	edit dl rm
uaccess.h	17019	0644	edit dl rm
unaligned.h	625	0644	edit dl rm
unwind.h	3446	0644	edit dl rm
vermagic.h	157	0644	edit dl rm
vmalloc.h	87	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/arch/arc/include/asm/smp.h (3823B)

/* 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;

#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)

#else /* !CONFIG_SMP */

#define atomic_ops_lock(flags)		local_irq_save(flags)
#define atomic_ops_unlock(flags)	local_irq_restore(flags)

#endif /* !CONFIG_SMP */

#endif	/* !CONFIG_ARC_HAS_LLSC */

#endif

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