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/* 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/cmpxchg.h> #include <asm/compiler.h> #include <asm/war.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 && R10000_LLSC_WAR) { unsigned long temp; __asm__ __volatile__( " .set push \n" " .set arch=r4000 \n" "1:" __LL "%1, %2 # local_add_return \n" " addu %0, %1, %3 \n" __SC "%0, %2 \n" " beqzl %0, 1b \n" " addu %0, %1, %3 \n" " .set pop \n" : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) : "Ir" (i), "m" (l->a.counter) : "memory"); } else if (kernel_uses_llsc) { unsigned long temp; __asm__ __volatile__( " .set push \n" " .set "MIPS_ISA_ARCH_LEVEL" \n" "1:" __LL "%1, %2 # local_add_return \n" " addu %0, %1, %3 \n" __SC "%0, %2 \n" " beqz %0, 1b \n" " 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 && R10000_LLSC_WAR) { unsigned long temp; __asm__ __volatile__( " .set push \n" " .set arch=r4000 \n" "1:" __LL "%1, %2 # local_sub_return \n" " subu %0, %1, %3 \n" __SC "%0, %2 \n" " beqzl %0, 1b \n" " subu %0, %1, %3 \n" " .set pop \n" : "=&r" (result), "=&r" (temp), "=m" (l->a.counter) : "Ir" (i), "m" (l->a.counter) : "memory"); } else if (kernel_uses_llsc) { unsigned long temp; __asm__ __volatile__( " .set push \n" " .set "MIPS_ISA_ARCH_LEVEL" \n" "1:" __LL "%1, %2 # local_sub_return \n" " subu %0, %1, %3 \n" __SC "%0, %2 \n" " beqz %0, 1b \n" " 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; } #define local_cmpxchg(l, o, n) \ ((long)cmpxchg_local(&((l)->a.counter), (o), (n))) #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 */
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