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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 | /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ARCH_MIPS_LOCAL_H #define _ARCH_MIPS_LOCAL_H #include <linux/percpu.h> #include <linux/bitops.h> #include <linux/atomic.h> #include <asm/asm.h> #include <asm/cmpxchg.h> #include <asm/compiler.h> typedef struct { atomic_long_t a; } local_t; #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } #define local_read(l) atomic_long_read(&(l)->a) #define local_set(l, i) atomic_long_set(&(l)->a, (i)) #define local_add(i, l) atomic_long_add((i), (&(l)->a)) #define local_sub(i, l) atomic_long_sub((i), (&(l)->a)) #define local_inc(l) atomic_long_inc(&(l)->a) #define local_dec(l) atomic_long_dec(&(l)->a) /* * Same as above, but return the result value */ static __inline__ long local_add_return(long i, local_t * l) { unsigned long result; if (kernel_uses_llsc) { unsigned long temp; __asm__ __volatile__( " .set push \n" " .set "MIPS_ISA_ARCH_LEVEL" \n" __SYNC(full, loongson3_war) " \n" "1:" __stringify(LONG_LL) " %1, %2 \n" __stringify(LONG_ADDU) " %0, %1, %3 \n" __stringify(LONG_SC) " %0, %2 \n" __stringify(SC_BEQZ) " %0, 1b \n" __stringify(LONG_ADDU) " %0, %1, %3 \n" " .set pop \n" : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) : "Ir" (i), "m" (l->a.counter) : "memory"); } else { unsigned long flags; local_irq_save(flags); result = l->a.counter; result += i; l->a.counter = result; local_irq_restore(flags); } return result; } static __inline__ long local_sub_return(long i, local_t * l) { unsigned long result; if (kernel_uses_llsc) { unsigned long temp; __asm__ __volatile__( " .set push \n" " .set "MIPS_ISA_ARCH_LEVEL" \n" __SYNC(full, loongson3_war) " \n" "1:" __stringify(LONG_LL) " %1, %2 \n" __stringify(LONG_SUBU) " %0, %1, %3 \n" __stringify(LONG_SUBU) " %0, %1, %3 \n" __stringify(LONG_SC) " %0, %2 \n" __stringify(SC_BEQZ) " %0, 1b \n" __stringify(LONG_SUBU) " %0, %1, %3 \n" " .set pop \n" : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) : "Ir" (i), "m" (l->a.counter) : "memory"); } else { unsigned long flags; local_irq_save(flags); result = l->a.counter; result -= i; l->a.counter = result; local_irq_restore(flags); } return result; } static __inline__ long local_cmpxchg(local_t *l, long old, long new) { return cmpxchg_local(&l->a.counter, old, new); } static __inline__ bool local_try_cmpxchg(local_t *l, long *old, long new) { typeof(l->a.counter) *__old = (typeof(l->a.counter) *) old; return try_cmpxchg_local(&l->a.counter, __old, new); } #define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n))) /** * local_add_unless - add unless the number is a given value * @l: pointer of type local_t * @a: the amount to add to l... * @u: ...unless l is equal to u. * * Atomically adds @a to @l, so long as it was not @u. * Returns non-zero if @l was not @u, and zero otherwise. */ #define local_add_unless(l, a, u) \ ({ \ long c, old; \ c = local_read(l); \ while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \ c = old; \ c != (u); \ }) #define local_inc_not_zero(l) local_add_unless((l), 1, 0) #define local_dec_return(l) local_sub_return(1, (l)) #define local_inc_return(l) local_add_return(1, (l)) /* * local_sub_and_test - subtract value from variable and test result * @i: integer value to subtract * @l: pointer of type local_t * * Atomically subtracts @i from @l and returns * true if the result is zero, or false for all * other cases. */ #define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0) /* * local_inc_and_test - increment and test * @l: pointer of type local_t * * Atomically increments @l by 1 * and returns true if the result is zero, or false for all * other cases. */ #define local_inc_and_test(l) (local_inc_return(l) == 0) /* * local_dec_and_test - decrement by 1 and test * @l: pointer of type local_t * * Atomically decrements @l by 1 and * returns true if the result is 0, or false for all other * cases. */ #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0) /* * local_add_negative - add and test if negative * @l: pointer of type local_t * @i: integer value to add * * Atomically adds @i to @l and returns true * if the result is negative, or false when * result is greater than or equal to zero. */ #define local_add_negative(i, l) (local_add_return(i, (l)) < 0) /* Use these for per-cpu local_t variables: on some archs they are * much more efficient than these naive implementations. Note they take * a variable, not an address. */ #define __local_inc(l) ((l)->a.counter++) #define __local_dec(l) ((l)->a.counter++) #define __local_add(i, l) ((l)->a.counter+=(i)) #define __local_sub(i, l) ((l)->a.counter-=(i)) #endif /* _ARCH_MIPS_LOCAL_H */ |