1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ARCH_MIPS_LOCAL_H 3 #define _ARCH_MIPS_LOCAL_H 4 5 #include <linux/percpu.h> 6 #include <linux/bitops.h> 7 #include <linux/atomic.h> 8 #include <asm/cmpxchg.h> 9 #include <asm/compiler.h> 10 #include <asm/war.h> 11 12 typedef struct 13 { 14 atomic_long_t a; 15 } local_t; 16 17 #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } 18 19 #define local_read(l) atomic_long_read(&(l)->a) 20 #define local_set(l, i) atomic_long_set(&(l)->a, (i)) 21 22 #define local_add(i, l) atomic_long_add((i), (&(l)->a)) 23 #define local_sub(i, l) atomic_long_sub((i), (&(l)->a)) 24 #define local_inc(l) atomic_long_inc(&(l)->a) 25 #define local_dec(l) atomic_long_dec(&(l)->a) 26 27 /* 28 * Same as above, but return the result value 29 */ 30 static __inline__ long local_add_return(long i, local_t * l) 31 { 32 unsigned long result; 33 34 if (kernel_uses_llsc && R10000_LLSC_WAR) { 35 unsigned long temp; 36 37 __asm__ __volatile__( 38 " .set push \n" 39 " .set arch=r4000 \n" 40 __SYNC(full, loongson3_war) " \n" 41 "1:" __LL "%1, %2 # local_add_return \n" 42 " addu %0, %1, %3 \n" 43 __SC "%0, %2 \n" 44 " beqzl %0, 1b \n" 45 " addu %0, %1, %3 \n" 46 " .set pop \n" 47 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) 48 : "Ir" (i), "m" (l->a.counter) 49 : "memory"); 50 } else if (kernel_uses_llsc) { 51 unsigned long temp; 52 53 __asm__ __volatile__( 54 " .set push \n" 55 " .set "MIPS_ISA_ARCH_LEVEL" \n" 56 __SYNC(full, loongson3_war) " \n" 57 "1:" __LL "%1, %2 # local_add_return \n" 58 " addu %0, %1, %3 \n" 59 __SC "%0, %2 \n" 60 " beqz %0, 1b \n" 61 " addu %0, %1, %3 \n" 62 " .set pop \n" 63 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) 64 : "Ir" (i), "m" (l->a.counter) 65 : "memory"); 66 } else { 67 unsigned long flags; 68 69 local_irq_save(flags); 70 result = l->a.counter; 71 result += i; 72 l->a.counter = result; 73 local_irq_restore(flags); 74 } 75 76 return result; 77 } 78 79 static __inline__ long local_sub_return(long i, local_t * l) 80 { 81 unsigned long result; 82 83 if (kernel_uses_llsc && R10000_LLSC_WAR) { 84 unsigned long temp; 85 86 __asm__ __volatile__( 87 " .set push \n" 88 " .set arch=r4000 \n" 89 __SYNC(full, loongson3_war) " \n" 90 "1:" __LL "%1, %2 # local_sub_return \n" 91 " subu %0, %1, %3 \n" 92 __SC "%0, %2 \n" 93 " beqzl %0, 1b \n" 94 " subu %0, %1, %3 \n" 95 " .set pop \n" 96 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) 97 : "Ir" (i), "m" (l->a.counter) 98 : "memory"); 99 } else if (kernel_uses_llsc) { 100 unsigned long temp; 101 102 __asm__ __volatile__( 103 " .set push \n" 104 " .set "MIPS_ISA_ARCH_LEVEL" \n" 105 __SYNC(full, loongson3_war) " \n" 106 "1:" __LL "%1, %2 # local_sub_return \n" 107 " subu %0, %1, %3 \n" 108 __SC "%0, %2 \n" 109 " beqz %0, 1b \n" 110 " subu %0, %1, %3 \n" 111 " .set pop \n" 112 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) 113 : "Ir" (i), "m" (l->a.counter) 114 : "memory"); 115 } else { 116 unsigned long flags; 117 118 local_irq_save(flags); 119 result = l->a.counter; 120 result -= i; 121 l->a.counter = result; 122 local_irq_restore(flags); 123 } 124 125 return result; 126 } 127 128 #define local_cmpxchg(l, o, n) \ 129 ((long)cmpxchg_local(&((l)->a.counter), (o), (n))) 130 #define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n))) 131 132 /** 133 * local_add_unless - add unless the number is a given value 134 * @l: pointer of type local_t 135 * @a: the amount to add to l... 136 * @u: ...unless l is equal to u. 137 * 138 * Atomically adds @a to @l, so long as it was not @u. 139 * Returns non-zero if @l was not @u, and zero otherwise. 140 */ 141 #define local_add_unless(l, a, u) \ 142 ({ \ 143 long c, old; \ 144 c = local_read(l); \ 145 while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \ 146 c = old; \ 147 c != (u); \ 148 }) 149 #define local_inc_not_zero(l) local_add_unless((l), 1, 0) 150 151 #define local_dec_return(l) local_sub_return(1, (l)) 152 #define local_inc_return(l) local_add_return(1, (l)) 153 154 /* 155 * local_sub_and_test - subtract value from variable and test result 156 * @i: integer value to subtract 157 * @l: pointer of type local_t 158 * 159 * Atomically subtracts @i from @l and returns 160 * true if the result is zero, or false for all 161 * other cases. 162 */ 163 #define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0) 164 165 /* 166 * local_inc_and_test - increment and test 167 * @l: pointer of type local_t 168 * 169 * Atomically increments @l by 1 170 * and returns true if the result is zero, or false for all 171 * other cases. 172 */ 173 #define local_inc_and_test(l) (local_inc_return(l) == 0) 174 175 /* 176 * local_dec_and_test - decrement by 1 and test 177 * @l: pointer of type local_t 178 * 179 * Atomically decrements @l by 1 and 180 * returns true if the result is 0, or false for all other 181 * cases. 182 */ 183 #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0) 184 185 /* 186 * local_add_negative - add and test if negative 187 * @l: pointer of type local_t 188 * @i: integer value to add 189 * 190 * Atomically adds @i to @l and returns true 191 * if the result is negative, or false when 192 * result is greater than or equal to zero. 193 */ 194 #define local_add_negative(i, l) (local_add_return(i, (l)) < 0) 195 196 /* Use these for per-cpu local_t variables: on some archs they are 197 * much more efficient than these naive implementations. Note they take 198 * a variable, not an address. 199 */ 200 201 #define __local_inc(l) ((l)->a.counter++) 202 #define __local_dec(l) ((l)->a.counter++) 203 #define __local_add(i, l) ((l)->a.counter+=(i)) 204 #define __local_sub(i, l) ((l)->a.counter-=(i)) 205 206 #endif /* _ARCH_MIPS_LOCAL_H */ 207