From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/mips/include/asm/atomic.h | 591 ++++++++++++++++++++++++++++++++++ 1 file changed, 591 insertions(+) create mode 100644 kernel/arch/mips/include/asm/atomic.h (limited to 'kernel/arch/mips/include/asm/atomic.h') diff --git a/kernel/arch/mips/include/asm/atomic.h b/kernel/arch/mips/include/asm/atomic.h new file mode 100644 index 000000000..26d436336 --- /dev/null +++ b/kernel/arch/mips/include/asm/atomic.h @@ -0,0 +1,591 @@ +/* + * Atomic operations that C can't guarantee us. Useful for + * resource counting etc.. + * + * But use these as seldom as possible since they are much more slower + * than regular operations. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1996, 97, 99, 2000, 03, 04, 06 by Ralf Baechle + */ +#ifndef _ASM_ATOMIC_H +#define _ASM_ATOMIC_H + +#include +#include +#include +#include +#include +#include +#include + +#define ATOMIC_INIT(i) { (i) } + +/* + * atomic_read - read atomic variable + * @v: pointer of type atomic_t + * + * Atomically reads the value of @v. + */ +#define atomic_read(v) ACCESS_ONCE((v)->counter) + +/* + * atomic_set - set atomic variable + * @v: pointer of type atomic_t + * @i: required value + * + * Atomically sets the value of @v to @i. + */ +#define atomic_set(v, i) ((v)->counter = (i)) + +#define ATOMIC_OP(op, c_op, asm_op) \ +static __inline__ void atomic_##op(int i, atomic_t * v) \ +{ \ + if (kernel_uses_llsc && R10000_LLSC_WAR) { \ + int temp; \ + \ + __asm__ __volatile__( \ + " .set arch=r4000 \n" \ + "1: ll %0, %1 # atomic_" #op " \n" \ + " " #asm_op " %0, %2 \n" \ + " sc %0, %1 \n" \ + " beqzl %0, 1b \n" \ + " .set mips0 \n" \ + : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (v->counter) \ + : "Ir" (i)); \ + } else if (kernel_uses_llsc) { \ + int temp; \ + \ + do { \ + __asm__ __volatile__( \ + " .set "MIPS_ISA_LEVEL" \n" \ + " ll %0, %1 # atomic_" #op "\n" \ + " " #asm_op " %0, %2 \n" \ + " sc %0, %1 \n" \ + " .set mips0 \n" \ + : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (v->counter) \ + : "Ir" (i)); \ + } while (unlikely(!temp)); \ + } else { \ + unsigned long flags; \ + \ + raw_local_irq_save(flags); \ + v->counter c_op i; \ + raw_local_irq_restore(flags); \ + } \ +} + +#define ATOMIC_OP_RETURN(op, c_op, asm_op) \ +static __inline__ int atomic_##op##_return(int i, atomic_t * v) \ +{ \ + int result; \ + \ + smp_mb__before_llsc(); \ + \ + if (kernel_uses_llsc && R10000_LLSC_WAR) { \ + int temp; \ + \ + __asm__ __volatile__( \ + " .set arch=r4000 \n" \ + "1: ll %1, %2 # atomic_" #op "_return \n" \ + " " #asm_op " %0, %1, %3 \n" \ + " sc %0, %2 \n" \ + " beqzl %0, 1b \n" \ + " " #asm_op " %0, %1, %3 \n" \ + " .set mips0 \n" \ + : "=&r" (result), "=&r" (temp), \ + "+" GCC_OFF_SMALL_ASM() (v->counter) \ + : "Ir" (i)); \ + } else if (kernel_uses_llsc) { \ + int temp; \ + \ + do { \ + __asm__ __volatile__( \ + " .set "MIPS_ISA_LEVEL" \n" \ + " ll %1, %2 # atomic_" #op "_return \n" \ + " " #asm_op " %0, %1, %3 \n" \ + " sc %0, %2 \n" \ + " .set mips0 \n" \ + : "=&r" (result), "=&r" (temp), \ + "+" GCC_OFF_SMALL_ASM() (v->counter) \ + : "Ir" (i)); \ + } while (unlikely(!result)); \ + \ + result = temp; result c_op i; \ + } else { \ + unsigned long flags; \ + \ + raw_local_irq_save(flags); \ + result = v->counter; \ + result c_op i; \ + v->counter = result; \ + raw_local_irq_restore(flags); \ + } \ + \ + smp_llsc_mb(); \ + \ + return result; \ +} + +#define ATOMIC_OPS(op, c_op, asm_op) \ + ATOMIC_OP(op, c_op, asm_op) \ + ATOMIC_OP_RETURN(op, c_op, asm_op) + +ATOMIC_OPS(add, +=, addu) +ATOMIC_OPS(sub, -=, subu) + +#undef ATOMIC_OPS +#undef ATOMIC_OP_RETURN +#undef ATOMIC_OP + +/* + * atomic_sub_if_positive - conditionally subtract integer from atomic variable + * @i: integer value to subtract + * @v: pointer of type atomic_t + * + * Atomically test @v and subtract @i if @v is greater or equal than @i. + * The function returns the old value of @v minus @i. + */ +static __inline__ int atomic_sub_if_positive(int i, atomic_t * v) +{ + int result; + + smp_mb__before_llsc(); + + if (kernel_uses_llsc && R10000_LLSC_WAR) { + int temp; + + __asm__ __volatile__( + " .set arch=r4000 \n" + "1: ll %1, %2 # atomic_sub_if_positive\n" + " subu %0, %1, %3 \n" + " bltz %0, 1f \n" + " sc %0, %2 \n" + " .set noreorder \n" + " beqzl %0, 1b \n" + " subu %0, %1, %3 \n" + " .set reorder \n" + "1: \n" + " .set mips0 \n" + : "=&r" (result), "=&r" (temp), + "+" GCC_OFF_SMALL_ASM() (v->counter) + : "Ir" (i), GCC_OFF_SMALL_ASM() (v->counter) + : "memory"); + } else if (kernel_uses_llsc) { + int temp; + + __asm__ __volatile__( + " .set "MIPS_ISA_LEVEL" \n" + "1: ll %1, %2 # atomic_sub_if_positive\n" + " subu %0, %1, %3 \n" + " bltz %0, 1f \n" + " sc %0, %2 \n" + " .set noreorder \n" + " beqz %0, 1b \n" + " subu %0, %1, %3 \n" + " .set reorder \n" + "1: \n" + " .set mips0 \n" + : "=&r" (result), "=&r" (temp), + "+" GCC_OFF_SMALL_ASM() (v->counter) + : "Ir" (i)); + } else { + unsigned long flags; + + raw_local_irq_save(flags); + result = v->counter; + result -= i; + if (result >= 0) + v->counter = result; + raw_local_irq_restore(flags); + } + + smp_llsc_mb(); + + return result; +} + +#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) +#define atomic_xchg(v, new) (xchg(&((v)->counter), (new))) + +/** + * __atomic_add_unless - add unless the number is a given value + * @v: pointer of type atomic_t + * @a: the amount to add to v... + * @u: ...unless v is equal to u. + * + * Atomically adds @a to @v, so long as it was not @u. + * Returns the old value of @v. + */ +static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) +{ + int c, old; + c = atomic_read(v); + for (;;) { + if (unlikely(c == (u))) + break; + old = atomic_cmpxchg((v), c, c + (a)); + if (likely(old == c)) + break; + c = old; + } + return c; +} + +#define atomic_dec_return(v) atomic_sub_return(1, (v)) +#define atomic_inc_return(v) atomic_add_return(1, (v)) + +/* + * atomic_sub_and_test - subtract value from variable and test result + * @i: integer value to subtract + * @v: pointer of type atomic_t + * + * Atomically subtracts @i from @v and returns + * true if the result is zero, or false for all + * other cases. + */ +#define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0) + +/* + * atomic_inc_and_test - increment and test + * @v: pointer of type atomic_t + * + * Atomically increments @v by 1 + * and returns true if the result is zero, or false for all + * other cases. + */ +#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) + +/* + * atomic_dec_and_test - decrement by 1 and test + * @v: pointer of type atomic_t + * + * Atomically decrements @v by 1 and + * returns true if the result is 0, or false for all other + * cases. + */ +#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) + +/* + * atomic_dec_if_positive - decrement by 1 if old value positive + * @v: pointer of type atomic_t + */ +#define atomic_dec_if_positive(v) atomic_sub_if_positive(1, v) + +/* + * atomic_inc - increment atomic variable + * @v: pointer of type atomic_t + * + * Atomically increments @v by 1. + */ +#define atomic_inc(v) atomic_add(1, (v)) + +/* + * atomic_dec - decrement and test + * @v: pointer of type atomic_t + * + * Atomically decrements @v by 1. + */ +#define atomic_dec(v) atomic_sub(1, (v)) + +/* + * atomic_add_negative - add and test if negative + * @v: pointer of type atomic_t + * @i: integer value to add + * + * Atomically adds @i to @v and returns true + * if the result is negative, or false when + * result is greater than or equal to zero. + */ +#define atomic_add_negative(i, v) (atomic_add_return(i, (v)) < 0) + +#ifdef CONFIG_64BIT + +#define ATOMIC64_INIT(i) { (i) } + +/* + * atomic64_read - read atomic variable + * @v: pointer of type atomic64_t + * + */ +#define atomic64_read(v) ACCESS_ONCE((v)->counter) + +/* + * atomic64_set - set atomic variable + * @v: pointer of type atomic64_t + * @i: required value + */ +#define atomic64_set(v, i) ((v)->counter = (i)) + +#define ATOMIC64_OP(op, c_op, asm_op) \ +static __inline__ void atomic64_##op(long i, atomic64_t * v) \ +{ \ + if (kernel_uses_llsc && R10000_LLSC_WAR) { \ + long temp; \ + \ + __asm__ __volatile__( \ + " .set arch=r4000 \n" \ + "1: lld %0, %1 # atomic64_" #op " \n" \ + " " #asm_op " %0, %2 \n" \ + " scd %0, %1 \n" \ + " beqzl %0, 1b \n" \ + " .set mips0 \n" \ + : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (v->counter) \ + : "Ir" (i)); \ + } else if (kernel_uses_llsc) { \ + long temp; \ + \ + do { \ + __asm__ __volatile__( \ + " .set "MIPS_ISA_LEVEL" \n" \ + " lld %0, %1 # atomic64_" #op "\n" \ + " " #asm_op " %0, %2 \n" \ + " scd %0, %1 \n" \ + " .set mips0 \n" \ + : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (v->counter) \ + : "Ir" (i)); \ + } while (unlikely(!temp)); \ + } else { \ + unsigned long flags; \ + \ + raw_local_irq_save(flags); \ + v->counter c_op i; \ + raw_local_irq_restore(flags); \ + } \ +} + +#define ATOMIC64_OP_RETURN(op, c_op, asm_op) \ +static __inline__ long atomic64_##op##_return(long i, atomic64_t * v) \ +{ \ + long result; \ + \ + smp_mb__before_llsc(); \ + \ + if (kernel_uses_llsc && R10000_LLSC_WAR) { \ + long temp; \ + \ + __asm__ __volatile__( \ + " .set arch=r4000 \n" \ + "1: lld %1, %2 # atomic64_" #op "_return\n" \ + " " #asm_op " %0, %1, %3 \n" \ + " scd %0, %2 \n" \ + " beqzl %0, 1b \n" \ + " " #asm_op " %0, %1, %3 \n" \ + " .set mips0 \n" \ + : "=&r" (result), "=&r" (temp), \ + "+" GCC_OFF_SMALL_ASM() (v->counter) \ + : "Ir" (i)); \ + } else if (kernel_uses_llsc) { \ + long temp; \ + \ + do { \ + __asm__ __volatile__( \ + " .set "MIPS_ISA_LEVEL" \n" \ + " lld %1, %2 # atomic64_" #op "_return\n" \ + " " #asm_op " %0, %1, %3 \n" \ + " scd %0, %2 \n" \ + " .set mips0 \n" \ + : "=&r" (result), "=&r" (temp), \ + "=" GCC_OFF_SMALL_ASM() (v->counter) \ + : "Ir" (i), GCC_OFF_SMALL_ASM() (v->counter) \ + : "memory"); \ + } while (unlikely(!result)); \ + \ + result = temp; result c_op i; \ + } else { \ + unsigned long flags; \ + \ + raw_local_irq_save(flags); \ + result = v->counter; \ + result c_op i; \ + v->counter = result; \ + raw_local_irq_restore(flags); \ + } \ + \ + smp_llsc_mb(); \ + \ + return result; \ +} + +#define ATOMIC64_OPS(op, c_op, asm_op) \ + ATOMIC64_OP(op, c_op, asm_op) \ + ATOMIC64_OP_RETURN(op, c_op, asm_op) + +ATOMIC64_OPS(add, +=, daddu) +ATOMIC64_OPS(sub, -=, dsubu) + +#undef ATOMIC64_OPS +#undef ATOMIC64_OP_RETURN +#undef ATOMIC64_OP + +/* + * atomic64_sub_if_positive - conditionally subtract integer from atomic + * variable + * @i: integer value to subtract + * @v: pointer of type atomic64_t + * + * Atomically test @v and subtract @i if @v is greater or equal than @i. + * The function returns the old value of @v minus @i. + */ +static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v) +{ + long result; + + smp_mb__before_llsc(); + + if (kernel_uses_llsc && R10000_LLSC_WAR) { + long temp; + + __asm__ __volatile__( + " .set arch=r4000 \n" + "1: lld %1, %2 # atomic64_sub_if_positive\n" + " dsubu %0, %1, %3 \n" + " bltz %0, 1f \n" + " scd %0, %2 \n" + " .set noreorder \n" + " beqzl %0, 1b \n" + " dsubu %0, %1, %3 \n" + " .set reorder \n" + "1: \n" + " .set mips0 \n" + : "=&r" (result), "=&r" (temp), + "=" GCC_OFF_SMALL_ASM() (v->counter) + : "Ir" (i), GCC_OFF_SMALL_ASM() (v->counter) + : "memory"); + } else if (kernel_uses_llsc) { + long temp; + + __asm__ __volatile__( + " .set "MIPS_ISA_LEVEL" \n" + "1: lld %1, %2 # atomic64_sub_if_positive\n" + " dsubu %0, %1, %3 \n" + " bltz %0, 1f \n" + " scd %0, %2 \n" + " .set noreorder \n" + " beqz %0, 1b \n" + " dsubu %0, %1, %3 \n" + " .set reorder \n" + "1: \n" + " .set mips0 \n" + : "=&r" (result), "=&r" (temp), + "+" GCC_OFF_SMALL_ASM() (v->counter) + : "Ir" (i)); + } else { + unsigned long flags; + + raw_local_irq_save(flags); + result = v->counter; + result -= i; + if (result >= 0) + v->counter = result; + raw_local_irq_restore(flags); + } + + smp_llsc_mb(); + + return result; +} + +#define atomic64_cmpxchg(v, o, n) \ + ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) +#define atomic64_xchg(v, new) (xchg(&((v)->counter), (new))) + +/** + * atomic64_add_unless - add unless the number is a given value + * @v: pointer of type atomic64_t + * @a: the amount to add to v... + * @u: ...unless v is equal to u. + * + * Atomically adds @a to @v, so long as it was not @u. + * Returns the old value of @v. + */ +static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) +{ + long c, old; + c = atomic64_read(v); + for (;;) { + if (unlikely(c == (u))) + break; + old = atomic64_cmpxchg((v), c, c + (a)); + if (likely(old == c)) + break; + c = old; + } + return c != (u); +} + +#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) + +#define atomic64_dec_return(v) atomic64_sub_return(1, (v)) +#define atomic64_inc_return(v) atomic64_add_return(1, (v)) + +/* + * atomic64_sub_and_test - subtract value from variable and test result + * @i: integer value to subtract + * @v: pointer of type atomic64_t + * + * Atomically subtracts @i from @v and returns + * true if the result is zero, or false for all + * other cases. + */ +#define atomic64_sub_and_test(i, v) (atomic64_sub_return((i), (v)) == 0) + +/* + * atomic64_inc_and_test - increment and test + * @v: pointer of type atomic64_t + * + * Atomically increments @v by 1 + * and returns true if the result is zero, or false for all + * other cases. + */ +#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) + +/* + * atomic64_dec_and_test - decrement by 1 and test + * @v: pointer of type atomic64_t + * + * Atomically decrements @v by 1 and + * returns true if the result is 0, or false for all other + * cases. + */ +#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) + +/* + * atomic64_dec_if_positive - decrement by 1 if old value positive + * @v: pointer of type atomic64_t + */ +#define atomic64_dec_if_positive(v) atomic64_sub_if_positive(1, v) + +/* + * atomic64_inc - increment atomic variable + * @v: pointer of type atomic64_t + * + * Atomically increments @v by 1. + */ +#define atomic64_inc(v) atomic64_add(1, (v)) + +/* + * atomic64_dec - decrement and test + * @v: pointer of type atomic64_t + * + * Atomically decrements @v by 1. + */ +#define atomic64_dec(v) atomic64_sub(1, (v)) + +/* + * atomic64_add_negative - add and test if negative + * @v: pointer of type atomic64_t + * @i: integer value to add + * + * Atomically adds @i to @v and returns true + * if the result is negative, or false when + * result is greater than or equal to zero. + */ +#define atomic64_add_negative(i, v) (atomic64_add_return(i, (v)) < 0) + +#endif /* CONFIG_64BIT */ + +#endif /* _ASM_ATOMIC_H */ -- cgit 1.2.3-korg