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Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/include/asm/atomic_lse.h | 572 |
1 files changed, 572 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/atomic_lse.h b/arch/arm64/include/asm/atomic_lse.h new file mode 100644 index 000000000..80cadc789 --- /dev/null +++ b/arch/arm64/include/asm/atomic_lse.h @@ -0,0 +1,572 @@ +/* + * Based on arch/arm/include/asm/atomic.h + * + * Copyright (C) 1996 Russell King. + * Copyright (C) 2002 Deep Blue Solutions Ltd. + * 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_ATOMIC_LSE_H +#define __ASM_ATOMIC_LSE_H + +#ifndef __ARM64_IN_ATOMIC_IMPL +#error "please don't include this file directly" +#endif + +#define __LL_SC_ATOMIC(op) __LL_SC_CALL(atomic_##op) +#define ATOMIC_OP(op, asm_op) \ +static inline void atomic_##op(int i, atomic_t *v) \ +{ \ + register int w0 asm ("w0") = i; \ + register atomic_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN(__LL_SC_ATOMIC(op), \ +" " #asm_op " %w[i], %[v]\n") \ + : [i] "+r" (w0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS); \ +} + +ATOMIC_OP(andnot, stclr) +ATOMIC_OP(or, stset) +ATOMIC_OP(xor, steor) +ATOMIC_OP(add, stadd) + +#undef ATOMIC_OP + +#define ATOMIC_FETCH_OP(name, mb, op, asm_op, cl...) \ +static inline int atomic_fetch_##op##name(int i, atomic_t *v) \ +{ \ + register int w0 asm ("w0") = i; \ + register atomic_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_ATOMIC(fetch_##op##name), \ + /* LSE atomics */ \ +" " #asm_op #mb " %w[i], %w[i], %[v]") \ + : [i] "+r" (w0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS, ##cl); \ + \ + return w0; \ +} + +#define ATOMIC_FETCH_OPS(op, asm_op) \ + ATOMIC_FETCH_OP(_relaxed, , op, asm_op) \ + ATOMIC_FETCH_OP(_acquire, a, op, asm_op, "memory") \ + ATOMIC_FETCH_OP(_release, l, op, asm_op, "memory") \ + ATOMIC_FETCH_OP( , al, op, asm_op, "memory") + +ATOMIC_FETCH_OPS(andnot, ldclr) +ATOMIC_FETCH_OPS(or, ldset) +ATOMIC_FETCH_OPS(xor, ldeor) +ATOMIC_FETCH_OPS(add, ldadd) + +#undef ATOMIC_FETCH_OP +#undef ATOMIC_FETCH_OPS + +#define ATOMIC_OP_ADD_RETURN(name, mb, cl...) \ +static inline int atomic_add_return##name(int i, atomic_t *v) \ +{ \ + register int w0 asm ("w0") = i; \ + register atomic_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_ATOMIC(add_return##name) \ + __nops(1), \ + /* LSE atomics */ \ + " ldadd" #mb " %w[i], w30, %[v]\n" \ + " add %w[i], %w[i], w30") \ + : [i] "+r" (w0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS, ##cl); \ + \ + return w0; \ +} + +ATOMIC_OP_ADD_RETURN(_relaxed, ) +ATOMIC_OP_ADD_RETURN(_acquire, a, "memory") +ATOMIC_OP_ADD_RETURN(_release, l, "memory") +ATOMIC_OP_ADD_RETURN( , al, "memory") + +#undef ATOMIC_OP_ADD_RETURN + +static inline void atomic_and(int i, atomic_t *v) +{ + register int w0 asm ("w0") = i; + register atomic_t *x1 asm ("x1") = v; + + asm volatile( + __LSE_PREAMBLE + ARM64_LSE_ATOMIC_INSN( + /* LL/SC */ + __LL_SC_ATOMIC(and) + __nops(1), + /* LSE atomics */ + " mvn %w[i], %w[i]\n" + " stclr %w[i], %[v]") + : [i] "+&r" (w0), [v] "+Q" (v->counter) + : "r" (x1) + : __LL_SC_CLOBBERS); +} + +#define ATOMIC_FETCH_OP_AND(name, mb, cl...) \ +static inline int atomic_fetch_and##name(int i, atomic_t *v) \ +{ \ + register int w0 asm ("w0") = i; \ + register atomic_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_ATOMIC(fetch_and##name) \ + __nops(1), \ + /* LSE atomics */ \ + " mvn %w[i], %w[i]\n" \ + " ldclr" #mb " %w[i], %w[i], %[v]") \ + : [i] "+&r" (w0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS, ##cl); \ + \ + return w0; \ +} + +ATOMIC_FETCH_OP_AND(_relaxed, ) +ATOMIC_FETCH_OP_AND(_acquire, a, "memory") +ATOMIC_FETCH_OP_AND(_release, l, "memory") +ATOMIC_FETCH_OP_AND( , al, "memory") + +#undef ATOMIC_FETCH_OP_AND + +static inline void atomic_sub(int i, atomic_t *v) +{ + register int w0 asm ("w0") = i; + register atomic_t *x1 asm ("x1") = v; + + asm volatile( + __LSE_PREAMBLE + ARM64_LSE_ATOMIC_INSN( + /* LL/SC */ + __LL_SC_ATOMIC(sub) + __nops(1), + /* LSE atomics */ + " neg %w[i], %w[i]\n" + " stadd %w[i], %[v]") + : [i] "+&r" (w0), [v] "+Q" (v->counter) + : "r" (x1) + : __LL_SC_CLOBBERS); +} + +#define ATOMIC_OP_SUB_RETURN(name, mb, cl...) \ +static inline int atomic_sub_return##name(int i, atomic_t *v) \ +{ \ + register int w0 asm ("w0") = i; \ + register atomic_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_ATOMIC(sub_return##name) \ + __nops(2), \ + /* LSE atomics */ \ + " neg %w[i], %w[i]\n" \ + " ldadd" #mb " %w[i], w30, %[v]\n" \ + " add %w[i], %w[i], w30") \ + : [i] "+&r" (w0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS , ##cl); \ + \ + return w0; \ +} + +ATOMIC_OP_SUB_RETURN(_relaxed, ) +ATOMIC_OP_SUB_RETURN(_acquire, a, "memory") +ATOMIC_OP_SUB_RETURN(_release, l, "memory") +ATOMIC_OP_SUB_RETURN( , al, "memory") + +#undef ATOMIC_OP_SUB_RETURN + +#define ATOMIC_FETCH_OP_SUB(name, mb, cl...) \ +static inline int atomic_fetch_sub##name(int i, atomic_t *v) \ +{ \ + register int w0 asm ("w0") = i; \ + register atomic_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_ATOMIC(fetch_sub##name) \ + __nops(1), \ + /* LSE atomics */ \ + " neg %w[i], %w[i]\n" \ + " ldadd" #mb " %w[i], %w[i], %[v]") \ + : [i] "+&r" (w0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS, ##cl); \ + \ + return w0; \ +} + +ATOMIC_FETCH_OP_SUB(_relaxed, ) +ATOMIC_FETCH_OP_SUB(_acquire, a, "memory") +ATOMIC_FETCH_OP_SUB(_release, l, "memory") +ATOMIC_FETCH_OP_SUB( , al, "memory") + +#undef ATOMIC_FETCH_OP_SUB +#undef __LL_SC_ATOMIC + +#define __LL_SC_ATOMIC64(op) __LL_SC_CALL(atomic64_##op) +#define ATOMIC64_OP(op, asm_op) \ +static inline void atomic64_##op(long i, atomic64_t *v) \ +{ \ + register long x0 asm ("x0") = i; \ + register atomic64_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN(__LL_SC_ATOMIC64(op), \ +" " #asm_op " %[i], %[v]\n") \ + : [i] "+r" (x0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS); \ +} + +ATOMIC64_OP(andnot, stclr) +ATOMIC64_OP(or, stset) +ATOMIC64_OP(xor, steor) +ATOMIC64_OP(add, stadd) + +#undef ATOMIC64_OP + +#define ATOMIC64_FETCH_OP(name, mb, op, asm_op, cl...) \ +static inline long atomic64_fetch_##op##name(long i, atomic64_t *v) \ +{ \ + register long x0 asm ("x0") = i; \ + register atomic64_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_ATOMIC64(fetch_##op##name), \ + /* LSE atomics */ \ +" " #asm_op #mb " %[i], %[i], %[v]") \ + : [i] "+r" (x0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS, ##cl); \ + \ + return x0; \ +} + +#define ATOMIC64_FETCH_OPS(op, asm_op) \ + ATOMIC64_FETCH_OP(_relaxed, , op, asm_op) \ + ATOMIC64_FETCH_OP(_acquire, a, op, asm_op, "memory") \ + ATOMIC64_FETCH_OP(_release, l, op, asm_op, "memory") \ + ATOMIC64_FETCH_OP( , al, op, asm_op, "memory") + +ATOMIC64_FETCH_OPS(andnot, ldclr) +ATOMIC64_FETCH_OPS(or, ldset) +ATOMIC64_FETCH_OPS(xor, ldeor) +ATOMIC64_FETCH_OPS(add, ldadd) + +#undef ATOMIC64_FETCH_OP +#undef ATOMIC64_FETCH_OPS + +#define ATOMIC64_OP_ADD_RETURN(name, mb, cl...) \ +static inline long atomic64_add_return##name(long i, atomic64_t *v) \ +{ \ + register long x0 asm ("x0") = i; \ + register atomic64_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_ATOMIC64(add_return##name) \ + __nops(1), \ + /* LSE atomics */ \ + " ldadd" #mb " %[i], x30, %[v]\n" \ + " add %[i], %[i], x30") \ + : [i] "+r" (x0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS, ##cl); \ + \ + return x0; \ +} + +ATOMIC64_OP_ADD_RETURN(_relaxed, ) +ATOMIC64_OP_ADD_RETURN(_acquire, a, "memory") +ATOMIC64_OP_ADD_RETURN(_release, l, "memory") +ATOMIC64_OP_ADD_RETURN( , al, "memory") + +#undef ATOMIC64_OP_ADD_RETURN + +static inline void atomic64_and(long i, atomic64_t *v) +{ + register long x0 asm ("x0") = i; + register atomic64_t *x1 asm ("x1") = v; + + asm volatile( + __LSE_PREAMBLE + ARM64_LSE_ATOMIC_INSN( + /* LL/SC */ + __LL_SC_ATOMIC64(and) + __nops(1), + /* LSE atomics */ + " mvn %[i], %[i]\n" + " stclr %[i], %[v]") + : [i] "+&r" (x0), [v] "+Q" (v->counter) + : "r" (x1) + : __LL_SC_CLOBBERS); +} + +#define ATOMIC64_FETCH_OP_AND(name, mb, cl...) \ +static inline long atomic64_fetch_and##name(long i, atomic64_t *v) \ +{ \ + register long x0 asm ("x0") = i; \ + register atomic64_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_ATOMIC64(fetch_and##name) \ + __nops(1), \ + /* LSE atomics */ \ + " mvn %[i], %[i]\n" \ + " ldclr" #mb " %[i], %[i], %[v]") \ + : [i] "+&r" (x0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS, ##cl); \ + \ + return x0; \ +} + +ATOMIC64_FETCH_OP_AND(_relaxed, ) +ATOMIC64_FETCH_OP_AND(_acquire, a, "memory") +ATOMIC64_FETCH_OP_AND(_release, l, "memory") +ATOMIC64_FETCH_OP_AND( , al, "memory") + +#undef ATOMIC64_FETCH_OP_AND + +static inline void atomic64_sub(long i, atomic64_t *v) +{ + register long x0 asm ("x0") = i; + register atomic64_t *x1 asm ("x1") = v; + + asm volatile( + __LSE_PREAMBLE + ARM64_LSE_ATOMIC_INSN( + /* LL/SC */ + __LL_SC_ATOMIC64(sub) + __nops(1), + /* LSE atomics */ + " neg %[i], %[i]\n" + " stadd %[i], %[v]") + : [i] "+&r" (x0), [v] "+Q" (v->counter) + : "r" (x1) + : __LL_SC_CLOBBERS); +} + +#define ATOMIC64_OP_SUB_RETURN(name, mb, cl...) \ +static inline long atomic64_sub_return##name(long i, atomic64_t *v) \ +{ \ + register long x0 asm ("x0") = i; \ + register atomic64_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_ATOMIC64(sub_return##name) \ + __nops(2), \ + /* LSE atomics */ \ + " neg %[i], %[i]\n" \ + " ldadd" #mb " %[i], x30, %[v]\n" \ + " add %[i], %[i], x30") \ + : [i] "+&r" (x0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS, ##cl); \ + \ + return x0; \ +} + +ATOMIC64_OP_SUB_RETURN(_relaxed, ) +ATOMIC64_OP_SUB_RETURN(_acquire, a, "memory") +ATOMIC64_OP_SUB_RETURN(_release, l, "memory") +ATOMIC64_OP_SUB_RETURN( , al, "memory") + +#undef ATOMIC64_OP_SUB_RETURN + +#define ATOMIC64_FETCH_OP_SUB(name, mb, cl...) \ +static inline long atomic64_fetch_sub##name(long i, atomic64_t *v) \ +{ \ + register long x0 asm ("x0") = i; \ + register atomic64_t *x1 asm ("x1") = v; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_ATOMIC64(fetch_sub##name) \ + __nops(1), \ + /* LSE atomics */ \ + " neg %[i], %[i]\n" \ + " ldadd" #mb " %[i], %[i], %[v]") \ + : [i] "+&r" (x0), [v] "+Q" (v->counter) \ + : "r" (x1) \ + : __LL_SC_CLOBBERS, ##cl); \ + \ + return x0; \ +} + +ATOMIC64_FETCH_OP_SUB(_relaxed, ) +ATOMIC64_FETCH_OP_SUB(_acquire, a, "memory") +ATOMIC64_FETCH_OP_SUB(_release, l, "memory") +ATOMIC64_FETCH_OP_SUB( , al, "memory") + +#undef ATOMIC64_FETCH_OP_SUB + +static inline long atomic64_dec_if_positive(atomic64_t *v) +{ + register long x0 asm ("x0") = (long)v; + + asm volatile( + __LSE_PREAMBLE + ARM64_LSE_ATOMIC_INSN( + /* LL/SC */ + __LL_SC_ATOMIC64(dec_if_positive) + __nops(6), + /* LSE atomics */ + "1: ldr x30, %[v]\n" + " subs %[ret], x30, #1\n" + " b.lt 2f\n" + " casal x30, %[ret], %[v]\n" + " sub x30, x30, #1\n" + " sub x30, x30, %[ret]\n" + " cbnz x30, 1b\n" + "2:") + : [ret] "+&r" (x0), [v] "+Q" (v->counter) + : + : __LL_SC_CLOBBERS, "cc", "memory"); + + return x0; +} + +#undef __LL_SC_ATOMIC64 + +#define __LL_SC_CMPXCHG(op) __LL_SC_CALL(__cmpxchg_case_##op) + +#define __CMPXCHG_CASE(w, sfx, name, sz, mb, cl...) \ +static inline u##sz __cmpxchg_case_##name##sz(volatile void *ptr, \ + unsigned long old, \ + u##sz new) \ +{ \ + register unsigned long x0 asm ("x0") = (unsigned long)ptr; \ + register unsigned long x1 asm ("x1") = old; \ + register u##sz x2 asm ("x2") = new; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_CMPXCHG(name##sz) \ + __nops(2), \ + /* LSE atomics */ \ + " mov " #w "30, %" #w "[old]\n" \ + " cas" #mb #sfx "\t" #w "30, %" #w "[new], %[v]\n" \ + " mov %" #w "[ret], " #w "30") \ + : [ret] "+r" (x0), [v] "+Q" (*(unsigned long *)ptr) \ + : [old] "r" (x1), [new] "r" (x2) \ + : __LL_SC_CLOBBERS, ##cl); \ + \ + return x0; \ +} + +__CMPXCHG_CASE(w, b, , 8, ) +__CMPXCHG_CASE(w, h, , 16, ) +__CMPXCHG_CASE(w, , , 32, ) +__CMPXCHG_CASE(x, , , 64, ) +__CMPXCHG_CASE(w, b, acq_, 8, a, "memory") +__CMPXCHG_CASE(w, h, acq_, 16, a, "memory") +__CMPXCHG_CASE(w, , acq_, 32, a, "memory") +__CMPXCHG_CASE(x, , acq_, 64, a, "memory") +__CMPXCHG_CASE(w, b, rel_, 8, l, "memory") +__CMPXCHG_CASE(w, h, rel_, 16, l, "memory") +__CMPXCHG_CASE(w, , rel_, 32, l, "memory") +__CMPXCHG_CASE(x, , rel_, 64, l, "memory") +__CMPXCHG_CASE(w, b, mb_, 8, al, "memory") +__CMPXCHG_CASE(w, h, mb_, 16, al, "memory") +__CMPXCHG_CASE(w, , mb_, 32, al, "memory") +__CMPXCHG_CASE(x, , mb_, 64, al, "memory") + +#undef __LL_SC_CMPXCHG +#undef __CMPXCHG_CASE + +#define __LL_SC_CMPXCHG_DBL(op) __LL_SC_CALL(__cmpxchg_double##op) + +#define __CMPXCHG_DBL(name, mb, cl...) \ +static inline long __cmpxchg_double##name(unsigned long old1, \ + unsigned long old2, \ + unsigned long new1, \ + unsigned long new2, \ + volatile void *ptr) \ +{ \ + unsigned long oldval1 = old1; \ + unsigned long oldval2 = old2; \ + register unsigned long x0 asm ("x0") = old1; \ + register unsigned long x1 asm ("x1") = old2; \ + register unsigned long x2 asm ("x2") = new1; \ + register unsigned long x3 asm ("x3") = new2; \ + register unsigned long x4 asm ("x4") = (unsigned long)ptr; \ + \ + asm volatile( \ + __LSE_PREAMBLE \ + ARM64_LSE_ATOMIC_INSN( \ + /* LL/SC */ \ + __LL_SC_CMPXCHG_DBL(name) \ + __nops(3), \ + /* LSE atomics */ \ + " casp" #mb "\t%[old1], %[old2], %[new1], %[new2], %[v]\n"\ + " eor %[old1], %[old1], %[oldval1]\n" \ + " eor %[old2], %[old2], %[oldval2]\n" \ + " orr %[old1], %[old1], %[old2]") \ + : [old1] "+&r" (x0), [old2] "+&r" (x1), \ + [v] "+Q" (*(unsigned long *)ptr) \ + : [new1] "r" (x2), [new2] "r" (x3), [ptr] "r" (x4), \ + [oldval1] "r" (oldval1), [oldval2] "r" (oldval2) \ + : __LL_SC_CLOBBERS, ##cl); \ + \ + return x0; \ +} + +__CMPXCHG_DBL( , ) +__CMPXCHG_DBL(_mb, al, "memory") + +#undef __LL_SC_CMPXCHG_DBL +#undef __CMPXCHG_DBL + +#endif /* __ASM_ATOMIC_LSE_H */ |