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-rw-r--r--arch/loongarch/include/asm/atomic.h362
1 files changed, 362 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/atomic.h b/arch/loongarch/include/asm/atomic.h
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+++ b/arch/loongarch/include/asm/atomic.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Atomic operations.
+ *
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#ifndef _ASM_ATOMIC_H
+#define _ASM_ATOMIC_H
+
+#include <linux/types.h>
+#include <asm/barrier.h>
+#include <asm/cmpxchg.h>
+#include <asm/compiler.h>
+
+#if __SIZEOF_LONG__ == 4
+#define __LL "ll.w "
+#define __SC "sc.w "
+#define __AMADD "amadd.w "
+#define __AMAND_DB "amand_db.w "
+#define __AMOR_DB "amor_db.w "
+#define __AMXOR_DB "amxor_db.w "
+#elif __SIZEOF_LONG__ == 8
+#define __LL "ll.d "
+#define __SC "sc.d "
+#define __AMADD "amadd.d "
+#define __AMAND_DB "amand_db.d "
+#define __AMOR_DB "amor_db.d "
+#define __AMXOR_DB "amxor_db.d "
+#endif
+
+#define ATOMIC_INIT(i) { (i) }
+
+/*
+ * arch_atomic_read - read atomic variable
+ * @v: pointer of type atomic_t
+ *
+ * Atomically reads the value of @v.
+ */
+#define arch_atomic_read(v) READ_ONCE((v)->counter)
+
+/*
+ * arch_atomic_set - set atomic variable
+ * @v: pointer of type atomic_t
+ * @i: required value
+ *
+ * Atomically sets the value of @v to @i.
+ */
+#define arch_atomic_set(v, i) WRITE_ONCE((v)->counter, (i))
+
+#define ATOMIC_OP(op, I, asm_op) \
+static inline void arch_atomic_##op(int i, atomic_t *v) \
+{ \
+ __asm__ __volatile__( \
+ "am"#asm_op"_db.w" " $zero, %1, %0 \n" \
+ : "+ZB" (v->counter) \
+ : "r" (I) \
+ : "memory"); \
+}
+
+#define ATOMIC_OP_RETURN(op, I, asm_op, c_op) \
+static inline int arch_atomic_##op##_return_relaxed(int i, atomic_t *v) \
+{ \
+ int result; \
+ \
+ __asm__ __volatile__( \
+ "am"#asm_op"_db.w" " %1, %2, %0 \n" \
+ : "+ZB" (v->counter), "=&r" (result) \
+ : "r" (I) \
+ : "memory"); \
+ \
+ return result c_op I; \
+}
+
+#define ATOMIC_FETCH_OP(op, I, asm_op) \
+static inline int arch_atomic_fetch_##op##_relaxed(int i, atomic_t *v) \
+{ \
+ int result; \
+ \
+ __asm__ __volatile__( \
+ "am"#asm_op"_db.w" " %1, %2, %0 \n" \
+ : "+ZB" (v->counter), "=&r" (result) \
+ : "r" (I) \
+ : "memory"); \
+ \
+ return result; \
+}
+
+#define ATOMIC_OPS(op, I, asm_op, c_op) \
+ ATOMIC_OP(op, I, asm_op) \
+ ATOMIC_OP_RETURN(op, I, asm_op, c_op) \
+ ATOMIC_FETCH_OP(op, I, asm_op)
+
+ATOMIC_OPS(add, i, add, +)
+ATOMIC_OPS(sub, -i, add, +)
+
+#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, I, asm_op) \
+ ATOMIC_OP(op, I, asm_op) \
+ ATOMIC_FETCH_OP(op, I, asm_op)
+
+ATOMIC_OPS(and, i, and)
+ATOMIC_OPS(or, i, or)
+ATOMIC_OPS(xor, i, 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
+#undef ATOMIC_OP_RETURN
+#undef ATOMIC_OP
+
+static inline int arch_atomic_fetch_add_unless(atomic_t *v, int a, int u)
+{
+ int prev, rc;
+
+ __asm__ __volatile__ (
+ "0: ll.w %[p], %[c]\n"
+ " beq %[p], %[u], 1f\n"
+ " add.w %[rc], %[p], %[a]\n"
+ " sc.w %[rc], %[c]\n"
+ " beqz %[rc], 0b\n"
+ " b 2f\n"
+ "1:\n"
+ __WEAK_LLSC_MB
+ "2:\n"
+ : [p]"=&r" (prev), [rc]"=&r" (rc),
+ [c]"=ZB" (v->counter)
+ : [a]"r" (a), [u]"r" (u)
+ : "memory");
+
+ return prev;
+}
+#define arch_atomic_fetch_add_unless arch_atomic_fetch_add_unless
+
+/*
+ * arch_atomic_sub_if_positive - conditionally subtract integer from atomic variable
+ * @i: integer value to subtract
+ * @v: pointer of type atomic_t
+ *
+ * Atomically test @v and subtract @i if @v is greater or equal than @i.
+ * The function returns the old value of @v minus @i.
+ */
+static inline int arch_atomic_sub_if_positive(int i, atomic_t *v)
+{
+ int result;
+ int temp;
+
+ if (__builtin_constant_p(i)) {
+ __asm__ __volatile__(
+ "1: ll.w %1, %2 # atomic_sub_if_positive\n"
+ " addi.w %0, %1, %3 \n"
+ " or %1, %0, $zero \n"
+ " blt %0, $zero, 2f \n"
+ " sc.w %1, %2 \n"
+ " beq $zero, %1, 1b \n"
+ "2: \n"
+ __WEAK_LLSC_MB
+ : "=&r" (result), "=&r" (temp),
+ "+" GCC_OFF_SMALL_ASM() (v->counter)
+ : "I" (-i));
+ } else {
+ __asm__ __volatile__(
+ "1: ll.w %1, %2 # atomic_sub_if_positive\n"
+ " sub.w %0, %1, %3 \n"
+ " or %1, %0, $zero \n"
+ " blt %0, $zero, 2f \n"
+ " sc.w %1, %2 \n"
+ " beq $zero, %1, 1b \n"
+ "2: \n"
+ __WEAK_LLSC_MB
+ : "=&r" (result), "=&r" (temp),
+ "+" GCC_OFF_SMALL_ASM() (v->counter)
+ : "r" (i));
+ }
+
+ return result;
+}
+
+#define arch_atomic_cmpxchg(v, o, n) (arch_cmpxchg(&((v)->counter), (o), (n)))
+#define arch_atomic_xchg(v, new) (arch_xchg(&((v)->counter), (new)))
+
+/*
+ * arch_atomic_dec_if_positive - decrement by 1 if old value positive
+ * @v: pointer of type atomic_t
+ */
+#define arch_atomic_dec_if_positive(v) arch_atomic_sub_if_positive(1, v)
+
+#ifdef CONFIG_64BIT
+
+#define ATOMIC64_INIT(i) { (i) }
+
+/*
+ * arch_atomic64_read - read atomic variable
+ * @v: pointer of type atomic64_t
+ *
+ */
+#define arch_atomic64_read(v) READ_ONCE((v)->counter)
+
+/*
+ * arch_atomic64_set - set atomic variable
+ * @v: pointer of type atomic64_t
+ * @i: required value
+ */
+#define arch_atomic64_set(v, i) WRITE_ONCE((v)->counter, (i))
+
+#define ATOMIC64_OP(op, I, asm_op) \
+static inline void arch_atomic64_##op(long i, atomic64_t *v) \
+{ \
+ __asm__ __volatile__( \
+ "am"#asm_op"_db.d " " $zero, %1, %0 \n" \
+ : "+ZB" (v->counter) \
+ : "r" (I) \
+ : "memory"); \
+}
+
+#define ATOMIC64_OP_RETURN(op, I, asm_op, c_op) \
+static inline long arch_atomic64_##op##_return_relaxed(long i, atomic64_t *v) \
+{ \
+ long result; \
+ __asm__ __volatile__( \
+ "am"#asm_op"_db.d " " %1, %2, %0 \n" \
+ : "+ZB" (v->counter), "=&r" (result) \
+ : "r" (I) \
+ : "memory"); \
+ \
+ return result c_op I; \
+}
+
+#define ATOMIC64_FETCH_OP(op, I, asm_op) \
+static inline long arch_atomic64_fetch_##op##_relaxed(long i, atomic64_t *v) \
+{ \
+ long result; \
+ \
+ __asm__ __volatile__( \
+ "am"#asm_op"_db.d " " %1, %2, %0 \n" \
+ : "+ZB" (v->counter), "=&r" (result) \
+ : "r" (I) \
+ : "memory"); \
+ \
+ return result; \
+}
+
+#define ATOMIC64_OPS(op, I, asm_op, c_op) \
+ ATOMIC64_OP(op, I, asm_op) \
+ ATOMIC64_OP_RETURN(op, I, asm_op, c_op) \
+ ATOMIC64_FETCH_OP(op, I, asm_op)
+
+ATOMIC64_OPS(add, i, add, +)
+ATOMIC64_OPS(sub, -i, add, +)
+
+#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, I, asm_op) \
+ ATOMIC64_OP(op, I, asm_op) \
+ ATOMIC64_FETCH_OP(op, I, asm_op)
+
+ATOMIC64_OPS(and, i, and)
+ATOMIC64_OPS(or, i, or)
+ATOMIC64_OPS(xor, i, 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 ATOMIC64_OPS
+#undef ATOMIC64_FETCH_OP
+#undef ATOMIC64_OP_RETURN
+#undef ATOMIC64_OP
+
+static inline long arch_atomic64_fetch_add_unless(atomic64_t *v, long a, long u)
+{
+ long prev, rc;
+
+ __asm__ __volatile__ (
+ "0: ll.d %[p], %[c]\n"
+ " beq %[p], %[u], 1f\n"
+ " add.d %[rc], %[p], %[a]\n"
+ " sc.d %[rc], %[c]\n"
+ " beqz %[rc], 0b\n"
+ " b 2f\n"
+ "1:\n"
+ __WEAK_LLSC_MB
+ "2:\n"
+ : [p]"=&r" (prev), [rc]"=&r" (rc),
+ [c] "=ZB" (v->counter)
+ : [a]"r" (a), [u]"r" (u)
+ : "memory");
+
+ return prev;
+}
+#define arch_atomic64_fetch_add_unless arch_atomic64_fetch_add_unless
+
+/*
+ * arch_atomic64_sub_if_positive - conditionally subtract integer from atomic variable
+ * @i: integer value to subtract
+ * @v: pointer of type atomic64_t
+ *
+ * Atomically test @v and subtract @i if @v is greater or equal than @i.
+ * The function returns the old value of @v minus @i.
+ */
+static inline long arch_atomic64_sub_if_positive(long i, atomic64_t *v)
+{
+ long result;
+ long temp;
+
+ if (__builtin_constant_p(i)) {
+ __asm__ __volatile__(
+ "1: ll.d %1, %2 # atomic64_sub_if_positive \n"
+ " addi.d %0, %1, %3 \n"
+ " or %1, %0, $zero \n"
+ " blt %0, $zero, 2f \n"
+ " sc.d %1, %2 \n"
+ " beq %1, $zero, 1b \n"
+ "2: \n"
+ __WEAK_LLSC_MB
+ : "=&r" (result), "=&r" (temp),
+ "+" GCC_OFF_SMALL_ASM() (v->counter)
+ : "I" (-i));
+ } else {
+ __asm__ __volatile__(
+ "1: ll.d %1, %2 # atomic64_sub_if_positive \n"
+ " sub.d %0, %1, %3 \n"
+ " or %1, %0, $zero \n"
+ " blt %0, $zero, 2f \n"
+ " sc.d %1, %2 \n"
+ " beq %1, $zero, 1b \n"
+ "2: \n"
+ __WEAK_LLSC_MB
+ : "=&r" (result), "=&r" (temp),
+ "+" GCC_OFF_SMALL_ASM() (v->counter)
+ : "r" (i));
+ }
+
+ return result;
+}
+
+#define arch_atomic64_cmpxchg(v, o, n) \
+ ((__typeof__((v)->counter))arch_cmpxchg(&((v)->counter), (o), (n)))
+#define arch_atomic64_xchg(v, new) (arch_xchg(&((v)->counter), (new)))
+
+/*
+ * arch_atomic64_dec_if_positive - decrement by 1 if old value positive
+ * @v: pointer of type atomic64_t
+ */
+#define arch_atomic64_dec_if_positive(v) arch_atomic64_sub_if_positive(1, v)
+
+#endif /* CONFIG_64BIT */
+
+#endif /* _ASM_ATOMIC_H */
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