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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_POWERPC_ATOMIC_H_ #define _ASM_POWERPC_ATOMIC_H_ /* * PowerPC atomic operations */ #ifdef __KERNEL__ #include <linux/types.h> #include <asm/cmpxchg.h> #include <asm/barrier.h> #include <asm/asm-const.h> /* * Since *_return_relaxed and {cmp}xchg_relaxed are implemented with * a "bne-" instruction at the end, so an isync is enough as a acquire barrier * on the platform without lwsync. */ #define __atomic_acquire_fence() \ __asm__ __volatile__(PPC_ACQUIRE_BARRIER "" : : : "memory") #define __atomic_release_fence() \ __asm__ __volatile__(PPC_RELEASE_BARRIER "" : : : "memory") static __inline__ int arch_atomic_read(const atomic_t *v) { int t; __asm__ __volatile__("lwz%U1%X1 %0,%1" : "=r"(t) : "m"UPD_CONSTR(v->counter)); return t; } static __inline__ void arch_atomic_set(atomic_t *v, int i) { __asm__ __volatile__("stw%U0%X0 %1,%0" : "=m"UPD_CONSTR(v->counter) : "r"(i)); } #define ATOMIC_OP(op, asm_op) \ static __inline__ void arch_atomic_##op(int a, atomic_t *v) \ { \ int t; \ \ __asm__ __volatile__( \ "1: lwarx %0,0,%3 # atomic_" #op "\n" \ #asm_op " %0,%2,%0\n" \ " stwcx. %0,0,%3 \n" \ " bne- 1b\n" \ : "=&r" (t), "+m" (v->counter) \ : "r" (a), "r" (&v->counter) \ : "cc"); \ } \ #define ATOMIC_OP_RETURN_RELAXED(op, asm_op) \ static inline int arch_atomic_##op##_return_relaxed(int a, atomic_t *v) \ { \ int t; \ \ __asm__ __volatile__( \ "1: lwarx %0,0,%3 # atomic_" #op "_return_relaxed\n" \ #asm_op " %0,%2,%0\n" \ " stwcx. %0,0,%3\n" \ " bne- 1b\n" \ : "=&r" (t), "+m" (v->counter) \ : "r" (a), "r" (&v->counter) \ : "cc"); \ \ return t; \ } #define ATOMIC_FETCH_OP_RELAXED(op, asm_op) \ static inline int arch_atomic_fetch_##op##_relaxed(int a, atomic_t *v) \ { \ int res, t; \ \ __asm__ __volatile__( \ "1: lwarx %0,0,%4 # atomic_fetch_" #op "_relaxed\n" \ #asm_op " %1,%3,%0\n" \ " stwcx. %1,0,%4\n" \ " bne- 1b\n" \ : "=&r" (res), "=&r" (t), "+m" (v->counter) \ : "r" (a), "r" (&v->counter) \ : "cc"); \ \ return res; \ } #define ATOMIC_OPS(op, asm_op) \ ATOMIC_OP(op, asm_op) \ ATOMIC_OP_RETURN_RELAXED(op, asm_op) \ ATOMIC_FETCH_OP_RELAXED(op, asm_op) ATOMIC_OPS(add, add) ATOMIC_OPS(sub, subf) #define arch_atomic_add_return_relaxed arch_atomic_add_return_relaxed #define arch_atomic_sub_return_relaxed arch_atomic_sub_return_relaxed #define arch_atomic_fetch_add_relaxed arch_atomic_fetch_add_relaxed #define arch_atomic_fetch_sub_relaxed arch_atomic_fetch_sub_relaxed #undef ATOMIC_OPS #define ATOMIC_OPS(op, asm_op) \ ATOMIC_OP(op, asm_op) \ ATOMIC_FETCH_OP_RELAXED(op, asm_op) ATOMIC_OPS(and, and) ATOMIC_OPS(or, or) ATOMIC_OPS(xor, xor) #define arch_atomic_fetch_and_relaxed arch_atomic_fetch_and_relaxed #define arch_atomic_fetch_or_relaxed arch_atomic_fetch_or_relaxed #define arch_atomic_fetch_xor_relaxed arch_atomic_fetch_xor_relaxed #undef ATOMIC_OPS #undef ATOMIC_FETCH_OP_RELAXED #undef ATOMIC_OP_RETURN_RELAXED #undef ATOMIC_OP static __inline__ void arch_atomic_inc(atomic_t *v) { int t; __asm__ __volatile__( "1: lwarx %0,0,%2 # atomic_inc\n\ addic %0,%0,1\n" " stwcx. %0,0,%2 \n\ bne- 1b" : "=&r" (t), "+m" (v->counter) : "r" (&v->counter) : "cc", "xer"); } #define arch_atomic_inc arch_atomic_inc static __inline__ int arch_atomic_inc_return_relaxed(atomic_t *v) { int t; __asm__ __volatile__( "1: lwarx %0,0,%2 # atomic_inc_return_relaxed\n" " addic %0,%0,1\n" " stwcx. %0,0,%2\n" " bne- 1b" : "=&r" (t), "+m" (v->counter) : "r" (&v->counter) : "cc", "xer"); return t; } static __inline__ void arch_atomic_dec(atomic_t *v) { int t; __asm__ __volatile__( "1: lwarx %0,0,%2 # atomic_dec\n\ addic %0,%0,-1\n" " stwcx. %0,0,%2\n\ bne- 1b" : "=&r" (t), "+m" (v->counter) : "r" (&v->counter) : "cc", "xer"); } #define arch_atomic_dec arch_atomic_dec static __inline__ int arch_atomic_dec_return_relaxed(atomic_t *v) { int t; __asm__ __volatile__( "1: lwarx %0,0,%2 # atomic_dec_return_relaxed\n" " addic %0,%0,-1\n" " stwcx. %0,0,%2\n" " bne- 1b" : "=&r" (t), "+m" (v->counter) : "r" (&v->counter) : "cc", "xer"); return t; } #define arch_atomic_inc_return_relaxed arch_atomic_inc_return_relaxed #define arch_atomic_dec_return_relaxed arch_atomic_dec_return_relaxed #define arch_atomic_cmpxchg(v, o, n) \ (arch_cmpxchg(&((v)->counter), (o), (n))) #define arch_atomic_cmpxchg_relaxed(v, o, n) \ arch_cmpxchg_relaxed(&((v)->counter), (o), (n)) #define arch_atomic_cmpxchg_acquire(v, o, n) \ arch_cmpxchg_acquire(&((v)->counter), (o), (n)) #define arch_atomic_xchg(v, new) \ (arch_xchg(&((v)->counter), new)) #define arch_atomic_xchg_relaxed(v, new) \ arch_xchg_relaxed(&((v)->counter), (new)) /* * Don't want to override the generic atomic_try_cmpxchg_acquire, because * we add a lock hint to the lwarx, which may not be wanted for the * _acquire case (and is not used by the other _acquire variants so it * would be a surprise). */ static __always_inline bool arch_atomic_try_cmpxchg_lock(atomic_t *v, int *old, int new) { int r, o = *old; __asm__ __volatile__ ( "1: lwarx %0,0,%2,%5 # atomic_try_cmpxchg_acquire \n" " cmpw 0,%0,%3 \n" " bne- 2f \n" " stwcx. %4,0,%2 \n" " bne- 1b \n" "\t" PPC_ACQUIRE_BARRIER " \n" "2: \n" : "=&r" (r), "+m" (v->counter) : "r" (&v->counter), "r" (o), "r" (new), "i" (IS_ENABLED(CONFIG_PPC64) ? 1 : 0) : "cr0", "memory"); if (unlikely(r != o)) *old = r; return likely(r == o); } /** * atomic_fetch_add_unless - add unless the number is a given value * @v: pointer of type atomic_t * @a: the amount to add to v... * @u: ...unless v is equal to u. * * Atomically adds @a to @v, so long as it was not @u. * Returns the old value of @v. */ static __inline__ int arch_atomic_fetch_add_unless(atomic_t *v, int a, int u) { int t; __asm__ __volatile__ ( PPC_ATOMIC_ENTRY_BARRIER "1: lwarx %0,0,%1 # atomic_fetch_add_unless\n\ cmpw 0,%0,%3 \n\ beq 2f \n\ add %0,%2,%0 \n" " stwcx. %0,0,%1 \n\ bne- 1b \n" PPC_ATOMIC_EXIT_BARRIER " subf %0,%2,%0 \n\ 2:" : "=&r" (t) : "r" (&v->counter), "r" (a), "r" (u) : "cc", "memory"); return t; } #define arch_atomic_fetch_add_unless arch_atomic_fetch_add_unless /** * atomic_inc_not_zero - increment unless the number is zero * @v: pointer of type atomic_t * * Atomically increments @v by 1, so long as @v is non-zero. * Returns non-zero if @v was non-zero, and zero otherwise. */ static __inline__ int arch_atomic_inc_not_zero(atomic_t *v) { int t1, t2; __asm__ __volatile__ ( PPC_ATOMIC_ENTRY_BARRIER "1: lwarx %0,0,%2 # atomic_inc_not_zero\n\ cmpwi 0,%0,0\n\ beq- 2f\n\ addic %1,%0,1\n" " stwcx. %1,0,%2\n\ bne- 1b\n" PPC_ATOMIC_EXIT_BARRIER "\n\ 2:" : "=&r" (t1), "=&r" (t2) : "r" (&v->counter) : "cc", "xer", "memory"); return t1; } #define arch_atomic_inc_not_zero(v) arch_atomic_inc_not_zero((v)) /* * Atomically test *v and decrement if it is greater than 0. * The function returns the old value of *v minus 1, even if * the atomic variable, v, was not decremented. */ static __inline__ int arch_atomic_dec_if_positive(atomic_t *v) { int t; __asm__ __volatile__( PPC_ATOMIC_ENTRY_BARRIER "1: lwarx %0,0,%1 # atomic_dec_if_positive\n\ cmpwi %0,1\n\ addi %0,%0,-1\n\ blt- 2f\n" " stwcx. %0,0,%1\n\ bne- 1b" PPC_ATOMIC_EXIT_BARRIER "\n\ 2:" : "=&b" (t) : "r" (&v->counter) : "cc", "memory"); return t; } #define arch_atomic_dec_if_positive arch_atomic_dec_if_positive #ifdef __powerpc64__ #define ATOMIC64_INIT(i) { (i) } static __inline__ s64 arch_atomic64_read(const atomic64_t *v) { s64 t; __asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m"UPD_CONSTR(v->counter)); return t; } static __inline__ void arch_atomic64_set(atomic64_t *v, s64 i) { __asm__ __volatile__("std%U0%X0 %1,%0" : "=m"UPD_CONSTR(v->counter) : "r"(i)); } #define ATOMIC64_OP(op, asm_op) \ static __inline__ void arch_atomic64_##op(s64 a, atomic64_t *v) \ { \ s64 t; \ \ __asm__ __volatile__( \ "1: ldarx %0,0,%3 # atomic64_" #op "\n" \ #asm_op " %0,%2,%0\n" \ " stdcx. %0,0,%3 \n" \ " bne- 1b\n" \ : "=&r" (t), "+m" (v->counter) \ : "r" (a), "r" (&v->counter) \ : "cc"); \ } #define ATOMIC64_OP_RETURN_RELAXED(op, asm_op) \ static inline s64 \ arch_atomic64_##op##_return_relaxed(s64 a, atomic64_t *v) \ { \ s64 t; \ \ __asm__ __volatile__( \ "1: ldarx %0,0,%3 # atomic64_" #op "_return_relaxed\n" \ #asm_op " %0,%2,%0\n" \ " stdcx. %0,0,%3\n" \ " bne- 1b\n" \ : "=&r" (t), "+m" (v->counter) \ : "r" (a), "r" (&v->counter) \ : "cc"); \ \ return t; \ } #define ATOMIC64_FETCH_OP_RELAXED(op, asm_op) \ static inline s64 \ arch_atomic64_fetch_##op##_relaxed(s64 a, atomic64_t *v) \ { \ s64 res, t; \ \ __asm__ __volatile__( \ "1: ldarx %0,0,%4 # atomic64_fetch_" #op "_relaxed\n" \ #asm_op " %1,%3,%0\n" \ " stdcx. %1,0,%4\n" \ " bne- 1b\n" \ : "=&r" (res), "=&r" (t), "+m" (v->counter) \ : "r" (a), "r" (&v->counter) \ : "cc"); \ \ return res; \ } #define ATOMIC64_OPS(op, asm_op) \ ATOMIC64_OP(op, asm_op) \ ATOMIC64_OP_RETURN_RELAXED(op, asm_op) \ ATOMIC64_FETCH_OP_RELAXED(op, asm_op) ATOMIC64_OPS(add, add) ATOMIC64_OPS(sub, subf) #define arch_atomic64_add_return_relaxed arch_atomic64_add_return_relaxed #define arch_atomic64_sub_return_relaxed arch_atomic64_sub_return_relaxed #define arch_atomic64_fetch_add_relaxed arch_atomic64_fetch_add_relaxed #define arch_atomic64_fetch_sub_relaxed arch_atomic64_fetch_sub_relaxed #undef ATOMIC64_OPS #define ATOMIC64_OPS(op, asm_op) \ ATOMIC64_OP(op, asm_op) \ ATOMIC64_FETCH_OP_RELAXED(op, asm_op) ATOMIC64_OPS(and, and) ATOMIC64_OPS(or, or) ATOMIC64_OPS(xor, xor) #define arch_atomic64_fetch_and_relaxed arch_atomic64_fetch_and_relaxed #define arch_atomic64_fetch_or_relaxed arch_atomic64_fetch_or_relaxed #define arch_atomic64_fetch_xor_relaxed arch_atomic64_fetch_xor_relaxed #undef ATOPIC64_OPS #undef ATOMIC64_FETCH_OP_RELAXED #undef ATOMIC64_OP_RETURN_RELAXED #undef ATOMIC64_OP static __inline__ void arch_atomic64_inc(atomic64_t *v) { s64 t; __asm__ __volatile__( "1: ldarx %0,0,%2 # atomic64_inc\n\ addic %0,%0,1\n\ stdcx. %0,0,%2 \n\ bne- 1b" : "=&r" (t), "+m" (v->counter) : "r" (&v->counter) : "cc", "xer"); } #define arch_atomic64_inc arch_atomic64_inc static __inline__ s64 arch_atomic64_inc_return_relaxed(atomic64_t *v) { s64 t; __asm__ __volatile__( "1: ldarx %0,0,%2 # atomic64_inc_return_relaxed\n" " addic %0,%0,1\n" " stdcx. %0,0,%2\n" " bne- 1b" : "=&r" (t), "+m" (v->counter) : "r" (&v->counter) : "cc", "xer"); return t; } static __inline__ void arch_atomic64_dec(atomic64_t *v) { s64 t; __asm__ __volatile__( "1: ldarx %0,0,%2 # atomic64_dec\n\ addic %0,%0,-1\n\ stdcx. %0,0,%2\n\ bne- 1b" : "=&r" (t), "+m" (v->counter) : "r" (&v->counter) : "cc", "xer"); } #define arch_atomic64_dec arch_atomic64_dec static __inline__ s64 arch_atomic64_dec_return_relaxed(atomic64_t *v) { s64 t; __asm__ __volatile__( "1: ldarx %0,0,%2 # atomic64_dec_return_relaxed\n" " addic %0,%0,-1\n" " stdcx. %0,0,%2\n" " bne- 1b" : "=&r" (t), "+m" (v->counter) : "r" (&v->counter) : "cc", "xer"); return t; } #define arch_atomic64_inc_return_relaxed arch_atomic64_inc_return_relaxed #define arch_atomic64_dec_return_relaxed arch_atomic64_dec_return_relaxed /* * Atomically test *v and decrement if it is greater than 0. * The function returns the old value of *v minus 1. */ static __inline__ s64 arch_atomic64_dec_if_positive(atomic64_t *v) { s64 t; __asm__ __volatile__( PPC_ATOMIC_ENTRY_BARRIER "1: ldarx %0,0,%1 # atomic64_dec_if_positive\n\ addic. %0,%0,-1\n\ blt- 2f\n\ stdcx. %0,0,%1\n\ bne- 1b" PPC_ATOMIC_EXIT_BARRIER "\n\ 2:" : "=&r" (t) : "r" (&v->counter) : "cc", "xer", "memory"); return t; } #define arch_atomic64_dec_if_positive arch_atomic64_dec_if_positive #define arch_atomic64_cmpxchg(v, o, n) \ (arch_cmpxchg(&((v)->counter), (o), (n))) #define arch_atomic64_cmpxchg_relaxed(v, o, n) \ arch_cmpxchg_relaxed(&((v)->counter), (o), (n)) #define arch_atomic64_cmpxchg_acquire(v, o, n) \ arch_cmpxchg_acquire(&((v)->counter), (o), (n)) #define arch_atomic64_xchg(v, new) \ (arch_xchg(&((v)->counter), new)) #define arch_atomic64_xchg_relaxed(v, new) \ arch_xchg_relaxed(&((v)->counter), (new)) /** * atomic64_fetch_add_unless - add unless the number is a given value * @v: pointer of type atomic64_t * @a: the amount to add to v... * @u: ...unless v is equal to u. * * Atomically adds @a to @v, so long as it was not @u. * Returns the old value of @v. */ static __inline__ s64 arch_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u) { s64 t; __asm__ __volatile__ ( PPC_ATOMIC_ENTRY_BARRIER "1: ldarx %0,0,%1 # atomic64_fetch_add_unless\n\ cmpd 0,%0,%3 \n\ beq 2f \n\ add %0,%2,%0 \n" " stdcx. %0,0,%1 \n\ bne- 1b \n" PPC_ATOMIC_EXIT_BARRIER " subf %0,%2,%0 \n\ 2:" : "=&r" (t) : "r" (&v->counter), "r" (a), "r" (u) : "cc", "memory"); return t; } #define arch_atomic64_fetch_add_unless arch_atomic64_fetch_add_unless /** * atomic_inc64_not_zero - increment unless the number is zero * @v: pointer of type atomic64_t * * Atomically increments @v by 1, so long as @v is non-zero. * Returns non-zero if @v was non-zero, and zero otherwise. */ static __inline__ int arch_atomic64_inc_not_zero(atomic64_t *v) { s64 t1, t2; __asm__ __volatile__ ( PPC_ATOMIC_ENTRY_BARRIER "1: ldarx %0,0,%2 # atomic64_inc_not_zero\n\ cmpdi 0,%0,0\n\ beq- 2f\n\ addic %1,%0,1\n\ stdcx. %1,0,%2\n\ bne- 1b\n" PPC_ATOMIC_EXIT_BARRIER "\n\ 2:" : "=&r" (t1), "=&r" (t2) : "r" (&v->counter) : "cc", "xer", "memory"); return t1 != 0; } #define arch_atomic64_inc_not_zero(v) arch_atomic64_inc_not_zero((v)) #endif /* __powerpc64__ */ #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_ATOMIC_H_ */