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206 lines
5.3 KiB
206 lines
5.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ARCH_MIPS_LOCAL_H |
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#define _ARCH_MIPS_LOCAL_H |
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#include <linux/percpu.h> |
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#include <linux/bitops.h> |
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#include <linux/atomic.h> |
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#include <asm/cmpxchg.h> |
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#include <asm/compiler.h> |
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#include <asm/war.h> |
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typedef struct |
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{ |
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atomic_long_t a; |
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} local_t; |
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#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } |
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#define local_read(l) atomic_long_read(&(l)->a) |
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#define local_set(l, i) atomic_long_set(&(l)->a, (i)) |
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#define local_add(i, l) atomic_long_add((i), (&(l)->a)) |
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#define local_sub(i, l) atomic_long_sub((i), (&(l)->a)) |
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#define local_inc(l) atomic_long_inc(&(l)->a) |
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#define local_dec(l) atomic_long_dec(&(l)->a) |
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/* |
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* Same as above, but return the result value |
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*/ |
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static __inline__ long local_add_return(long i, local_t * l) |
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{ |
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unsigned long result; |
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if (kernel_uses_llsc && IS_ENABLED(CONFIG_WAR_R10000_LLSC)) { |
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unsigned long temp; |
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__asm__ __volatile__( |
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" .set push \n" |
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" .set arch=r4000 \n" |
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__SYNC(full, loongson3_war) " \n" |
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"1:" __LL "%1, %2 # local_add_return \n" |
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" addu %0, %1, %3 \n" |
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__SC "%0, %2 \n" |
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" beqzl %0, 1b \n" |
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" addu %0, %1, %3 \n" |
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" .set pop \n" |
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: "=&r" (result), "=&r" (temp), "=m" (l->a.counter) |
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: "Ir" (i), "m" (l->a.counter) |
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: "memory"); |
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} else if (kernel_uses_llsc) { |
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unsigned long temp; |
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__asm__ __volatile__( |
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" .set push \n" |
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" .set "MIPS_ISA_ARCH_LEVEL" \n" |
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__SYNC(full, loongson3_war) " \n" |
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"1:" __LL "%1, %2 # local_add_return \n" |
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" addu %0, %1, %3 \n" |
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__SC "%0, %2 \n" |
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" beqz %0, 1b \n" |
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" addu %0, %1, %3 \n" |
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" .set pop \n" |
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: "=&r" (result), "=&r" (temp), "=m" (l->a.counter) |
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: "Ir" (i), "m" (l->a.counter) |
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: "memory"); |
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} else { |
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unsigned long flags; |
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local_irq_save(flags); |
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result = l->a.counter; |
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result += i; |
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l->a.counter = result; |
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local_irq_restore(flags); |
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} |
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return result; |
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} |
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static __inline__ long local_sub_return(long i, local_t * l) |
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{ |
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unsigned long result; |
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if (kernel_uses_llsc && IS_ENABLED(CONFIG_WAR_R10000_LLSC)) { |
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unsigned long temp; |
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__asm__ __volatile__( |
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" .set push \n" |
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" .set arch=r4000 \n" |
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__SYNC(full, loongson3_war) " \n" |
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"1:" __LL "%1, %2 # local_sub_return \n" |
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" subu %0, %1, %3 \n" |
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__SC "%0, %2 \n" |
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" beqzl %0, 1b \n" |
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" subu %0, %1, %3 \n" |
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" .set pop \n" |
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: "=&r" (result), "=&r" (temp), "=m" (l->a.counter) |
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: "Ir" (i), "m" (l->a.counter) |
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: "memory"); |
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} else if (kernel_uses_llsc) { |
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unsigned long temp; |
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__asm__ __volatile__( |
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" .set push \n" |
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" .set "MIPS_ISA_ARCH_LEVEL" \n" |
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__SYNC(full, loongson3_war) " \n" |
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"1:" __LL "%1, %2 # local_sub_return \n" |
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" subu %0, %1, %3 \n" |
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__SC "%0, %2 \n" |
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" beqz %0, 1b \n" |
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" subu %0, %1, %3 \n" |
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" .set pop \n" |
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: "=&r" (result), "=&r" (temp), "=m" (l->a.counter) |
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: "Ir" (i), "m" (l->a.counter) |
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: "memory"); |
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} else { |
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unsigned long flags; |
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local_irq_save(flags); |
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result = l->a.counter; |
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result -= i; |
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l->a.counter = result; |
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local_irq_restore(flags); |
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} |
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return result; |
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} |
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#define local_cmpxchg(l, o, n) \ |
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((long)cmpxchg_local(&((l)->a.counter), (o), (n))) |
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#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n))) |
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/** |
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* local_add_unless - add unless the number is a given value |
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* @l: pointer of type local_t |
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* @a: the amount to add to l... |
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* @u: ...unless l is equal to u. |
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* |
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* Atomically adds @a to @l, so long as it was not @u. |
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* Returns non-zero if @l was not @u, and zero otherwise. |
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*/ |
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#define local_add_unless(l, a, u) \ |
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({ \ |
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long c, old; \ |
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c = local_read(l); \ |
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while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \ |
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c = old; \ |
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c != (u); \ |
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}) |
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#define local_inc_not_zero(l) local_add_unless((l), 1, 0) |
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#define local_dec_return(l) local_sub_return(1, (l)) |
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#define local_inc_return(l) local_add_return(1, (l)) |
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/* |
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* local_sub_and_test - subtract value from variable and test result |
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* @i: integer value to subtract |
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* @l: pointer of type local_t |
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* |
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* Atomically subtracts @i from @l and returns |
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* true if the result is zero, or false for all |
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* other cases. |
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*/ |
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#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0) |
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/* |
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* local_inc_and_test - increment and test |
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* @l: pointer of type local_t |
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* |
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* Atomically increments @l by 1 |
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* and returns true if the result is zero, or false for all |
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* other cases. |
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*/ |
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#define local_inc_and_test(l) (local_inc_return(l) == 0) |
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/* |
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* local_dec_and_test - decrement by 1 and test |
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* @l: pointer of type local_t |
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* |
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* Atomically decrements @l by 1 and |
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* returns true if the result is 0, or false for all other |
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* cases. |
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*/ |
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#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0) |
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/* |
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* local_add_negative - add and test if negative |
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* @l: pointer of type local_t |
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* @i: integer value to add |
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* |
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* Atomically adds @i to @l and returns true |
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* if the result is negative, or false when |
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* result is greater than or equal to zero. |
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*/ |
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#define local_add_negative(i, l) (local_add_return(i, (l)) < 0) |
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/* Use these for per-cpu local_t variables: on some archs they are |
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* much more efficient than these naive implementations. Note they take |
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* a variable, not an address. |
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*/ |
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#define __local_inc(l) ((l)->a.counter++) |
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#define __local_dec(l) ((l)->a.counter++) |
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#define __local_add(i, l) ((l)->a.counter+=(i)) |
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#define __local_sub(i, l) ((l)->a.counter-=(i)) |
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#endif /* _ARCH_MIPS_LOCAL_H */
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