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/*
 * Based on arch/arm/include/asm/cmpxchg.h
 *
 * Copyright (C) 2012 ARM Ltd.
 *
 * 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 distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_CMPXCHG_H
#define __ASM_CMPXCHG_H

#include <linux/bug.h>

#include <asm/atomic.h>
#include <asm/barrier.h>
#include <asm/lse.h>

/*
 * We need separate acquire parameters for ll/sc and lse, since the full
 * barrier case is generated as release+dmb for the former and
 * acquire+release for the latter.
 */
#define __XCHG_CASE(w, sfx, name, sz, mb, nop_lse, acq, acq_lse, rel, cl)	\
static inline u##sz __xchg_case_##name##sz(u##sz x, volatile void *ptr)		\
{										\
	u##sz ret;								\
	unsigned long tmp;							\
										\
	asm volatile(ARM64_LSE_ATOMIC_INSN(					\
	/* LL/SC */								\
	"	prfm	pstl1strm, %2\n"					\
	"1:	ld" #acq "xr" #sfx "\t%" #w "0, %2\n"				\
	"	st" #rel "xr" #sfx "\t%w1, %" #w "3, %2\n"			\
	"	cbnz	%w1, 1b\n"						\
	"	" #mb,								\
	/* LSE atomics */							\
	"	swp" #acq_lse #rel #sfx "\t%" #w "3, %" #w "0, %2\n"		\
		__nops(3)							\
	"	" #nop_lse)							\
	: "=&r" (ret), "=&r" (tmp), "+Q" (*(u##sz *)ptr)			\
	: "r" (x)								\
	: cl);									\
										\
	return ret;								\
}

__XCHG_CASE(w, b,     ,  8,        ,    ,  ,  ,  ,         )
__XCHG_CASE(w, h,     , 16,        ,    ,  ,  ,  ,         )
__XCHG_CASE(w,  ,     , 32,        ,    ,  ,  ,  ,         )
__XCHG_CASE( ,  ,     , 64,        ,    ,  ,  ,  ,         )
__XCHG_CASE(w, b, acq_,  8,        ,    , a, a,  , "memory")
__XCHG_CASE(w, h, acq_, 16,        ,    , a, a,  , "memory")
__XCHG_CASE(w,  , acq_, 32,        ,    , a, a,  , "memory")
__XCHG_CASE( ,  , acq_, 64,        ,    , a, a,  , "memory")
__XCHG_CASE(w, b, rel_,  8,        ,    ,  ,  , l, "memory")
__XCHG_CASE(w, h, rel_, 16,        ,    ,  ,  , l, "memory")
__XCHG_CASE(w,  , rel_, 32,        ,    ,  ,  , l, "memory")
__XCHG_CASE( ,  , rel_, 64,        ,    ,  ,  , l, "memory")
__XCHG_CASE(w, b,  mb_,  8, dmb ish, nop,  , a, l, "memory")
__XCHG_CASE(w, h,  mb_, 16, dmb ish, nop,  , a, l, "memory")
__XCHG_CASE(w,  ,  mb_, 32, dmb ish, nop,  , a, l, "memory")
__XCHG_CASE( ,  ,  mb_, 64, dmb ish, nop,  , a, l, "memory")

#undef __XCHG_CASE

#define __XCHG_GEN(sfx)							\
static __always_inline  unsigned long __xchg##sfx(unsigned long x,	\
					volatile void *ptr,		\
					int size)			\
{									\
	switch (size) {							\
	case 1:								\
		return __xchg_case##sfx##_8(x, ptr);			\
	case 2:								\
		return __xchg_case##sfx##_16(x, ptr);			\
	case 4:								\
		return __xchg_case##sfx##_32(x, ptr);			\
	case 8:								\
		return __xchg_case##sfx##_64(x, ptr);			\
	default:							\
		BUILD_BUG();						\
	}								\
									\
	unreachable();							\
}

__XCHG_GEN()
__XCHG_GEN(_acq)
__XCHG_GEN(_rel)
__XCHG_GEN(_mb)

#undef __XCHG_GEN

#define __xchg_wrapper(sfx, ptr, x)					\
({									\
	__typeof__(*(ptr)) __ret;					\
	__ret = (__typeof__(*(ptr)))					\
		__xchg##sfx((unsigned long)(x), (ptr), sizeof(*(ptr))); \
	__ret;								\
})

/* xchg */
#define xchg_relaxed(...)	__xchg_wrapper(    , __VA_ARGS__)
#define xchg_acquire(...)	__xchg_wrapper(_acq, __VA_ARGS__)
#define xchg_release(...)	__xchg_wrapper(_rel, __VA_ARGS__)
#define xchg(...)		__xchg_wrapper( _mb, __VA_ARGS__)

#define __CMPXCHG_GEN(sfx)						\
static __always_inline unsigned long __cmpxchg##sfx(volatile void *ptr,	\
					   unsigned long old,		\
					   unsigned long new,		\
					   int size)			\
{									\
	switch (size) {							\
	case 1:								\
		return __cmpxchg_case##sfx##_8(ptr, (u8)old, new);	\
	case 2:								\
		return __cmpxchg_case##sfx##_16(ptr, (u16)old, new);	\
	case 4:								\
		return __cmpxchg_case##sfx##_32(ptr, old, new);		\
	case 8:								\
		return __cmpxchg_case##sfx##_64(ptr, old, new);		\
	default:							\
		BUILD_BUG();						\
	}								\
									\
	unreachable();							\
}

__CMPXCHG_GEN()
__CMPXCHG_GEN(_acq)
__CMPXCHG_GEN(_rel)
__CMPXCHG_GEN(_mb)

#undef __CMPXCHG_GEN

#define __cmpxchg_wrapper(sfx, ptr, o, n)				\
({									\
	__typeof__(*(ptr)) __ret;					\
	__ret = (__typeof__(*(ptr)))					\
		__cmpxchg##sfx((ptr), (unsigned long)(o),		\
				(unsigned long)(n), sizeof(*(ptr)));	\
	__ret;								\
})

/* cmpxchg */
#define cmpxchg_relaxed(...)	__cmpxchg_wrapper(    , __VA_ARGS__)
#define cmpxchg_acquire(...)	__cmpxchg_wrapper(_acq, __VA_ARGS__)
#define cmpxchg_release(...)	__cmpxchg_wrapper(_rel, __VA_ARGS__)
#define cmpxchg(...)		__cmpxchg_wrapper( _mb, __VA_ARGS__)
#define cmpxchg_local		cmpxchg_relaxed

/* cmpxchg64 */
#define cmpxchg64_relaxed	cmpxchg_relaxed
#define cmpxchg64_acquire	cmpxchg_acquire
#define cmpxchg64_release	cmpxchg_release
#define cmpxchg64		cmpxchg
#define cmpxchg64_local		cmpxchg_local

/* cmpxchg_double */
#define system_has_cmpxchg_double()     1

#define __cmpxchg_double_check(ptr1, ptr2)					\
({										\
	if (sizeof(*(ptr1)) != 8)						\
		BUILD_BUG();							\
	VM_BUG_ON((unsigned long *)(ptr2) - (unsigned long *)(ptr1) != 1);	\
})

#define cmpxchg_double(ptr1, ptr2, o1, o2, n1, n2) \
({\
	int __ret;\
	__cmpxchg_double_check(ptr1, ptr2); \
	__ret = !__cmpxchg_double_mb((unsigned long)(o1), (unsigned long)(o2), \
				     (unsigned long)(n1), (unsigned long)(n2), \
				     ptr1); \
	__ret; \
})

#define cmpxchg_double_local(ptr1, ptr2, o1, o2, n1, n2) \
({\
	int __ret;\
	__cmpxchg_double_check(ptr1, ptr2); \
	__ret = !__cmpxchg_double((unsigned long)(o1), (unsigned long)(o2), \
				  (unsigned long)(n1), (unsigned long)(n2), \
				  ptr1); \
	__ret; \
})

/* this_cpu_cmpxchg */
#define _protect_cmpxchg_local(pcp, o, n)			\
({								\
	typeof(*raw_cpu_ptr(&(pcp))) __ret;			\
	preempt_disable();					\
	__ret = cmpxchg_local(raw_cpu_ptr(&(pcp)), o, n);	\
	preempt_enable();					\
	__ret;							\
})

#define this_cpu_cmpxchg_1(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)
#define this_cpu_cmpxchg_2(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)
#define this_cpu_cmpxchg_4(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)
#define this_cpu_cmpxchg_8(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)

#define this_cpu_cmpxchg_double_8(ptr1, ptr2, o1, o2, n1, n2)		\
({									\
	int __ret;							\
	preempt_disable();						\
	__ret = cmpxchg_double_local(	raw_cpu_ptr(&(ptr1)),		\
					raw_cpu_ptr(&(ptr2)),		\
					o1, o2, n1, n2);		\
	preempt_enable();						\
	__ret;								\
})

#define __CMPWAIT_CASE(w, sfx, sz)					\
static inline void __cmpwait_case_##sz(volatile void *ptr,		\
				       unsigned long val)		\
{									\
	unsigned long tmp;						\
									\
	asm volatile(							\
	"	sevl\n"							\
	"	wfe\n"							\
	"	ldxr" #sfx "\t%" #w "[tmp], %[v]\n"			\
	"	eor	%" #w "[tmp], %" #w "[tmp], %" #w "[val]\n"	\
	"	cbnz	%" #w "[tmp], 1f\n"				\
	"	wfe\n"							\
	"1:"								\
	: [tmp] "=&r" (tmp), [v] "+Q" (*(unsigned long *)ptr)		\
	: [val] "r" (val));						\
}

__CMPWAIT_CASE(w, b, 8);
__CMPWAIT_CASE(w, h, 16);
__CMPWAIT_CASE(w,  , 32);
__CMPWAIT_CASE( ,  , 64);

#undef __CMPWAIT_CASE

#define __CMPWAIT_GEN(sfx)						\
static __always_inline void __cmpwait##sfx(volatile void *ptr,		\
				  unsigned long val,			\
				  int size)				\
{									\
	switch (size) {							\
	case 1:								\
		return __cmpwait_case##sfx##_8(ptr, (u8)val);		\
	case 2:								\
		return __cmpwait_case##sfx##_16(ptr, (u16)val);		\
	case 4:								\
		return __cmpwait_case##sfx##_32(ptr, val);		\
	case 8:								\
		return __cmpwait_case##sfx##_64(ptr, val);		\
	default:							\
		BUILD_BUG();						\
	}								\
									\
	unreachable();							\
}

__CMPWAIT_GEN()

#undef __CMPWAIT_GEN

#define __cmpwait_relaxed(ptr, val) \
	__cmpwait((ptr), (unsigned long)(val), sizeof(*(ptr)))

#endif	/* __ASM_CMPXCHG_H */

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Name Type Size Permission Actions
xen Folder 0755
Kbuild File 703 B 0644
acenv.h File 541 B 0644
acpi.h File 4.34 KB 0644
alternative.h File 7.63 KB 0644
arch_gicv3.h File 3.44 KB 0644
arch_timer.h File 4.87 KB 0644
arm-cci.h File 794 B 0644
asm-bug.h File 1.45 KB 0644
asm-offsets.h File 35 B 0644
asm-uaccess.h File 2.09 KB 0644
assembler.h File 13.51 KB 0644
atomic.h File 8.35 KB 0644
atomic_ll_sc.h File 10.62 KB 0644
atomic_lse.h File 14.82 KB 0644
barrier.h File 3.78 KB 0644
bitops.h File 1.9 KB 0644
bitrev.h File 452 B 0644
boot.h File 384 B 0644
brk-imm.h File 706 B 0644
bug.h File 1.09 KB 0644
cache.h File 2.23 KB 0644
cacheflush.h File 4.87 KB 0644
checksum.h File 1.35 KB 0644
clocksource.h File 192 B 0644
cmpxchg.h File 7.98 KB 0644
compat.h File 7.15 KB 0644
compiler.h File 1.18 KB 0644
cpu.h File 1.84 KB 0644
cpu_ops.h File 2.73 KB 0644
cpucaps.h File 1.83 KB 0644
cpufeature.h File 19.14 KB 0644
cpuidle.h File 401 B 0644
cputype.h File 8.1 KB 0644
current.h File 517 B 0644
daifflags.h File 1.59 KB 0644
dcc.h File 1.36 KB 0644
debug-monitors.h File 3.76 KB 0644
device.h File 886 B 0644
dma-mapping.h File 2.42 KB 0644
dmi.h File 850 B 0644
efi.h File 4.57 KB 0644
elf.h File 5.7 KB 0644
esr.h File 9.02 KB 0644
exception.h File 1.21 KB 0644
exec.h File 868 B 0644
extable.h File 815 B 0644
fb.h File 1000 B 0644
fixmap.h File 2.91 KB 0644
fpsimd.h File 4.21 KB 0644
fpsimdmacros.h File 5.62 KB 0644
ftrace.h File 1.92 KB 0644
futex.h File 3.41 KB 0644
hardirq.h File 2.08 KB 0644
hugetlb.h File 2.71 KB 0644
hw_breakpoint.h File 4.46 KB 0644
hwcap.h File 1.86 KB 0644
hypervisor.h File 144 B 0644
insn.h File 16.03 KB 0644
io.h File 7.72 KB 0644
irq.h File 307 B 0644
irq_work.h File 228 B 0644
irqflags.h File 2.3 KB 0644
jump_label.h File 1.68 KB 0644
kasan.h File 1.16 KB 0644
kernel-pgtable.h File 4.03 KB 0644
kexec.h File 2.42 KB 0644
kgdb.h File 3.79 KB 0644
kprobes.h File 1.74 KB 0644
kvm_arm.h File 8.38 KB 0644
kvm_asm.h File 4.26 KB 0644
kvm_coproc.h File 2.04 KB 0644
kvm_emulate.h File 10.38 KB 0644
kvm_host.h File 15.73 KB 0644
kvm_hyp.h File 5.79 KB 0644
kvm_mmio.h File 1.3 KB 0644
kvm_mmu.h File 11.72 KB 0644
linkage.h File 114 B 0644
lse.h File 1.26 KB 0644
memblock.h File 720 B 0644
memory.h File 9.32 KB 0644
mmu.h File 2.74 KB 0644
mmu_context.h File 6.35 KB 0644
mmzone.h File 266 B 0644
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pgtable-hwdef.h File 9.4 KB 0644
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ptrace.h File 9 KB 0644
sdei.h File 1.46 KB 0644
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sections.h File 1.46 KB 0644
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stage2_pgtable-nopud.h File 1.24 KB 0644
stage2_pgtable.h File 4.89 KB 0644
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suspend.h File 1.65 KB 0644
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tlb.h File 2.22 KB 0644
tlbflush.h File 5.38 KB 0644
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uaccess.h File 12.01 KB 0644
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unistd32.h File 27.53 KB 0644
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vdso.h File 1.09 KB 0644
vdso_datapage.h File 1.53 KB 0644
vectors.h File 1.75 KB 0644
virt.h File 3 KB 0644
vmap_stack.h File 769 B 0644
word-at-a-time.h File 2.22 KB 0644