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/asm.h>
  9#include <asm/cmpxchg.h>
 10#include <asm/compiler.h>
 
 11
 12typedef 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 */
 30static __inline__ long local_add_return(long i, local_t * l)
 31{
 32	unsigned long result;
 33
 34	if (kernel_uses_llsc) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 35		unsigned long temp;
 36
 37		__asm__ __volatile__(
 38		"	.set	push					\n"
 39		"	.set	"MIPS_ISA_ARCH_LEVEL"			\n"
 40			__SYNC(full, loongson3_war) "                   \n"
 41		"1:"	__stringify(LONG_LL)	"	%1, %2		\n"
 42			__stringify(LONG_ADDU)	"	%0, %1, %3	\n"
 43			__stringify(LONG_SC)	"	%0, %2		\n"
 44			__stringify(SC_BEQZ)	"	%0, 1b		\n"
 45			__stringify(LONG_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 {
 51		unsigned long flags;
 52
 53		local_irq_save(flags);
 54		result = l->a.counter;
 55		result += i;
 56		l->a.counter = result;
 57		local_irq_restore(flags);
 58	}
 59
 60	return result;
 61}
 62
 63static __inline__ long local_sub_return(long i, local_t * l)
 64{
 65	unsigned long result;
 66
 67	if (kernel_uses_llsc) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 68		unsigned long temp;
 69
 70		__asm__ __volatile__(
 71		"	.set	push					\n"
 72		"	.set	"MIPS_ISA_ARCH_LEVEL"			\n"
 73			__SYNC(full, loongson3_war) "                   \n"
 74		"1:"	__stringify(LONG_LL)	"	%1, %2		\n"
 75			__stringify(LONG_SUBU)	"	%0, %1, %3	\n"
 76			__stringify(LONG_SUBU)	"	%0, %1, %3	\n"
 77			__stringify(LONG_SC)	"	%0, %2		\n"
 78			__stringify(SC_BEQZ)	"	%0, 1b		\n"
 79			__stringify(LONG_SUBU)	"	%0, %1, %3	\n"
 80		"	.set	pop					\n"
 81		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
 82		: "Ir" (i), "m" (l->a.counter)
 83		: "memory");
 84	} else {
 85		unsigned long flags;
 86
 87		local_irq_save(flags);
 88		result = l->a.counter;
 89		result -= i;
 90		l->a.counter = result;
 91		local_irq_restore(flags);
 92	}
 93
 94	return result;
 95}
 96
 97static __inline__ long local_cmpxchg(local_t *l, long old, long new)
 98{
 99	return cmpxchg_local(&l->a.counter, old, new);
100}
101
102static __inline__ bool local_try_cmpxchg(local_t *l, long *old, long new)
103{
104	return try_cmpxchg_local(&l->a.counter,
105				 (typeof(l->a.counter) *) old, new);
106}
107
108#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
109
110/**
111 * local_add_unless - add unless the number is already a given value
112 * @l: pointer of type local_t
113 * @a: the amount to add to l...
114 * @u: ...unless l is equal to u.
115 *
116 * Atomically adds @a to @l, if @v was not already @u.
117 * Returns true if the addition was done.
118 */
119static __inline__ bool
120local_add_unless(local_t *l, long a, long u)
121{
122	long c = local_read(l);
123
124	do {
125		if (unlikely(c == u))
126			return false;
127	} while (!local_try_cmpxchg(l, &c, c + a));
128
129	return true;
130}
131
132#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
133
134#define local_dec_return(l) local_sub_return(1, (l))
135#define local_inc_return(l) local_add_return(1, (l))
136
137/*
138 * local_sub_and_test - subtract value from variable and test result
139 * @i: integer value to subtract
140 * @l: pointer of type local_t
141 *
142 * Atomically subtracts @i from @l and returns
143 * true if the result is zero, or false for all
144 * other cases.
145 */
146#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
147
148/*
149 * local_inc_and_test - increment and test
150 * @l: pointer of type local_t
151 *
152 * Atomically increments @l by 1
153 * and returns true if the result is zero, or false for all
154 * other cases.
155 */
156#define local_inc_and_test(l) (local_inc_return(l) == 0)
157
158/*
159 * local_dec_and_test - decrement by 1 and test
160 * @l: pointer of type local_t
161 *
162 * Atomically decrements @l by 1 and
163 * returns true if the result is 0, or false for all other
164 * cases.
165 */
166#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
167
168/*
169 * local_add_negative - add and test if negative
170 * @l: pointer of type local_t
171 * @i: integer value to add
172 *
173 * Atomically adds @i to @l and returns true
174 * if the result is negative, or false when
175 * result is greater than or equal to zero.
176 */
177#define local_add_negative(i, l) (local_add_return(i, (l)) < 0)
178
179/* Use these for per-cpu local_t variables: on some archs they are
180 * much more efficient than these naive implementations.  Note they take
181 * a variable, not an address.
182 */
183
184#define __local_inc(l)		((l)->a.counter++)
185#define __local_dec(l)		((l)->a.counter++)
186#define __local_add(i, l)	((l)->a.counter+=(i))
187#define __local_sub(i, l)	((l)->a.counter-=(i))
188
189#endif /* _ARCH_MIPS_LOCAL_H */

 
  1#ifndef _ARCH_MIPS_LOCAL_H
  2#define _ARCH_MIPS_LOCAL_H
  3
  4#include <linux/percpu.h>
  5#include <linux/bitops.h>
  6#include <linux/atomic.h>
 
  7#include <asm/cmpxchg.h>
  8#include <asm/compiler.h>
  9#include <asm/war.h>
 10
 11typedef struct
 12{
 13	atomic_long_t a;
 14} local_t;
 15
 16#define LOCAL_INIT(i)	{ ATOMIC_LONG_INIT(i) }
 17
 18#define local_read(l)	atomic_long_read(&(l)->a)
 19#define local_set(l, i) atomic_long_set(&(l)->a, (i))
 20
 21#define local_add(i, l) atomic_long_add((i), (&(l)->a))
 22#define local_sub(i, l) atomic_long_sub((i), (&(l)->a))
 23#define local_inc(l)	atomic_long_inc(&(l)->a)
 24#define local_dec(l)	atomic_long_dec(&(l)->a)
 25
 26/*
 27 * Same as above, but return the result value
 28 */
 29static __inline__ long local_add_return(long i, local_t * l)
 30{
 31	unsigned long result;
 32
 33	if (kernel_uses_llsc && R10000_LLSC_WAR) {
 34		unsigned long temp;
 35
 36		__asm__ __volatile__(
 37		"	.set	arch=r4000				\n"
 38		"1:"	__LL	"%1, %2		# local_add_return	\n"
 39		"	addu	%0, %1, %3				\n"
 40			__SC	"%0, %2					\n"
 41		"	beqzl	%0, 1b					\n"
 42		"	addu	%0, %1, %3				\n"
 43		"	.set	mips0					\n"
 44		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
 45		: "Ir" (i), "m" (l->a.counter)
 46		: "memory");
 47	} else if (kernel_uses_llsc) {
 48		unsigned long temp;
 49
 50		__asm__ __volatile__(
 
 51		"	.set	"MIPS_ISA_ARCH_LEVEL"			\n"
 52		"1:"	__LL	"%1, %2		# local_add_return	\n"
 53		"	addu	%0, %1, %3				\n"
 54			__SC	"%0, %2					\n"
 55		"	beqz	%0, 1b					\n"
 56		"	addu	%0, %1, %3				\n"
 57		"	.set	mips0					\n"
 
 58		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
 59		: "Ir" (i), "m" (l->a.counter)
 60		: "memory");
 61	} else {
 62		unsigned long flags;
 63
 64		local_irq_save(flags);
 65		result = l->a.counter;
 66		result += i;
 67		l->a.counter = result;
 68		local_irq_restore(flags);
 69	}
 70
 71	return result;
 72}
 73
 74static __inline__ long local_sub_return(long i, local_t * l)
 75{
 76	unsigned long result;
 77
 78	if (kernel_uses_llsc && R10000_LLSC_WAR) {
 79		unsigned long temp;
 80
 81		__asm__ __volatile__(
 82		"	.set	arch=r4000				\n"
 83		"1:"	__LL	"%1, %2		# local_sub_return	\n"
 84		"	subu	%0, %1, %3				\n"
 85			__SC	"%0, %2					\n"
 86		"	beqzl	%0, 1b					\n"
 87		"	subu	%0, %1, %3				\n"
 88		"	.set	mips0					\n"
 89		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
 90		: "Ir" (i), "m" (l->a.counter)
 91		: "memory");
 92	} else if (kernel_uses_llsc) {
 93		unsigned long temp;
 94
 95		__asm__ __volatile__(
 
 96		"	.set	"MIPS_ISA_ARCH_LEVEL"			\n"
 97		"1:"	__LL	"%1, %2		# local_sub_return	\n"
 98		"	subu	%0, %1, %3				\n"
 99			__SC	"%0, %2					\n"
100		"	beqz	%0, 1b					\n"
101		"	subu	%0, %1, %3				\n"
102		"	.set	mips0					\n"
 
 
103		: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
104		: "Ir" (i), "m" (l->a.counter)
105		: "memory");
106	} else {
107		unsigned long flags;
108
109		local_irq_save(flags);
110		result = l->a.counter;
111		result -= i;
112		l->a.counter = result;
113		local_irq_restore(flags);
114	}
115
116	return result;
117}
118
119#define local_cmpxchg(l, o, n) \
120	((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
 
 
 
 
 
 
 
 
 
121#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
122
123/**
124 * local_add_unless - add unless the number is a given value
125 * @l: pointer of type local_t
126 * @a: the amount to add to l...
127 * @u: ...unless l is equal to u.
128 *
129 * Atomically adds @a to @l, so long as it was not @u.
130 * Returns non-zero if @l was not @u, and zero otherwise.
131 */
132#define local_add_unless(l, a, u)				\
133({								\
134	long c, old;						\
135	c = local_read(l);					\
136	while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
137		c = old;					\
138	c != (u);						\
139})
 
 
 
 
 
140#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
141
142#define local_dec_return(l) local_sub_return(1, (l))
143#define local_inc_return(l) local_add_return(1, (l))
144
145/*
146 * local_sub_and_test - subtract value from variable and test result
147 * @i: integer value to subtract
148 * @l: pointer of type local_t
149 *
150 * Atomically subtracts @i from @l and returns
151 * true if the result is zero, or false for all
152 * other cases.
153 */
154#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
155
156/*
157 * local_inc_and_test - increment and test
158 * @l: pointer of type local_t
159 *
160 * Atomically increments @l by 1
161 * and returns true if the result is zero, or false for all
162 * other cases.
163 */
164#define local_inc_and_test(l) (local_inc_return(l) == 0)
165
166/*
167 * local_dec_and_test - decrement by 1 and test
168 * @l: pointer of type local_t
169 *
170 * Atomically decrements @l by 1 and
171 * returns true if the result is 0, or false for all other
172 * cases.
173 */
174#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
175
176/*
177 * local_add_negative - add and test if negative
178 * @l: pointer of type local_t
179 * @i: integer value to add
180 *
181 * Atomically adds @i to @l and returns true
182 * if the result is negative, or false when
183 * result is greater than or equal to zero.
184 */
185#define local_add_negative(i, l) (local_add_return(i, (l)) < 0)
186
187/* Use these for per-cpu local_t variables: on some archs they are
188 * much more efficient than these naive implementations.  Note they take
189 * a variable, not an address.
190 */
191
192#define __local_inc(l)		((l)->a.counter++)
193#define __local_dec(l)		((l)->a.counter++)
194#define __local_add(i, l)	((l)->a.counter+=(i))
195#define __local_sub(i, l)	((l)->a.counter-=(i))
196
197#endif /* _ARCH_MIPS_LOCAL_H */