^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * atomic32.c: 32-bit atomic_t implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2004 Keith M Wesolowski
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2007 Kyle McMartin
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Based on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define ATOMIC_HASH_SIZE 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define ATOMIC_HASH(a) (&__atomic_hash[(((unsigned long)a)>>8) & (ATOMIC_HASH_SIZE-1)])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) [0 ... (ATOMIC_HASH_SIZE-1)] = __SPIN_LOCK_UNLOCKED(__atomic_hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #else /* SMP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static DEFINE_SPINLOCK(dummy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define ATOMIC_HASH_SIZE 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define ATOMIC_HASH(a) (&dummy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #endif /* SMP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define ATOMIC_FETCH_OP(op, c_op) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int atomic_fetch_##op(int i, atomic_t *v) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) int ret; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) unsigned long flags; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) spin_lock_irqsave(ATOMIC_HASH(v), flags); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) ret = v->counter; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) v->counter c_op i; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) spin_unlock_irqrestore(ATOMIC_HASH(v), flags); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return ret; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) EXPORT_SYMBOL(atomic_fetch_##op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define ATOMIC_OP_RETURN(op, c_op) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int atomic_##op##_return(int i, atomic_t *v) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) int ret; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unsigned long flags; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) spin_lock_irqsave(ATOMIC_HASH(v), flags); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) ret = (v->counter c_op i); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) spin_unlock_irqrestore(ATOMIC_HASH(v), flags); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return ret; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) EXPORT_SYMBOL(atomic_##op##_return);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) ATOMIC_OP_RETURN(add, +=)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ATOMIC_FETCH_OP(add, +=)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) ATOMIC_FETCH_OP(and, &=)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) ATOMIC_FETCH_OP(or, |=)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) ATOMIC_FETCH_OP(xor, ^=)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #undef ATOMIC_FETCH_OP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #undef ATOMIC_OP_RETURN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int atomic_xchg(atomic_t *v, int new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) spin_lock_irqsave(ATOMIC_HASH(v), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) ret = v->counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) v->counter = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) EXPORT_SYMBOL(atomic_xchg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) int atomic_cmpxchg(atomic_t *v, int old, int new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) spin_lock_irqsave(ATOMIC_HASH(v), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) ret = v->counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (likely(ret == old))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) v->counter = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) EXPORT_SYMBOL(atomic_cmpxchg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) int atomic_fetch_add_unless(atomic_t *v, int a, int u)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) spin_lock_irqsave(ATOMIC_HASH(v), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) ret = v->counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (ret != u)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) v->counter += a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) EXPORT_SYMBOL(atomic_fetch_add_unless);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /* Atomic operations are already serializing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) void atomic_set(atomic_t *v, int i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) spin_lock_irqsave(ATOMIC_HASH(v), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) v->counter = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) EXPORT_SYMBOL(atomic_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) unsigned long ___set_bit(unsigned long *addr, unsigned long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) unsigned long old, flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) spin_lock_irqsave(ATOMIC_HASH(addr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) old = *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) *addr = old | mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) spin_unlock_irqrestore(ATOMIC_HASH(addr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return old & mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) EXPORT_SYMBOL(___set_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) unsigned long ___clear_bit(unsigned long *addr, unsigned long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) unsigned long old, flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) spin_lock_irqsave(ATOMIC_HASH(addr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) old = *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) *addr = old & ~mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) spin_unlock_irqrestore(ATOMIC_HASH(addr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return old & mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) EXPORT_SYMBOL(___clear_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) unsigned long ___change_bit(unsigned long *addr, unsigned long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) unsigned long old, flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) spin_lock_irqsave(ATOMIC_HASH(addr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) old = *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) *addr = old ^ mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) spin_unlock_irqrestore(ATOMIC_HASH(addr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return old & mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) EXPORT_SYMBOL(___change_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) unsigned long __cmpxchg_u32(volatile u32 *ptr, u32 old, u32 new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) u32 prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) spin_lock_irqsave(ATOMIC_HASH(ptr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if ((prev = *ptr) == old)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) *ptr = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return (unsigned long)prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) EXPORT_SYMBOL(__cmpxchg_u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) u64 __cmpxchg_u64(u64 *ptr, u64 old, u64 new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) u64 prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) spin_lock_irqsave(ATOMIC_HASH(ptr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if ((prev = *ptr) == old)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) *ptr = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) EXPORT_SYMBOL(__cmpxchg_u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) unsigned long __xchg_u32(volatile u32 *ptr, u32 new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) u32 prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) spin_lock_irqsave(ATOMIC_HASH(ptr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) prev = *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) *ptr = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return (unsigned long)prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) EXPORT_SYMBOL(__xchg_u32);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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