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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2007-05-08 03:34:58 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 14:15:20 -0400
commitc343c14aec1e70a51575e3c29391ee86ae7dbeb2 (patch)
treeeddb78478509927951aee847fa135da1a958fdc6 /include
parent469b50b622a4f581fd38e3eaf8a94d453f01cc81 (diff)
local_t: x86_64 extension
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-x86_64/local.h196
-rw-r--r--include/asm-x86_64/system.h36
2 files changed, 201 insertions, 31 deletions
diff --git a/include/asm-x86_64/local.h b/include/asm-x86_64/local.h
index e769e6200225..e87492bb0693 100644
--- a/include/asm-x86_64/local.h
+++ b/include/asm-x86_64/local.h
@@ -2,49 +2,183 @@
2#define _ARCH_X8664_LOCAL_H 2#define _ARCH_X8664_LOCAL_H
3 3
4#include <linux/percpu.h> 4#include <linux/percpu.h>
5#include <asm/atomic.h>
5 6
6typedef struct 7typedef struct
7{ 8{
8 volatile long counter; 9 atomic_long_t a;
9} local_t; 10} local_t;
10 11
11#define LOCAL_INIT(i) { (i) } 12#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
12 13
13#define local_read(v) ((v)->counter) 14#define local_read(l) atomic_long_read(&(l)->a)
14#define local_set(v,i) (((v)->counter) = (i)) 15#define local_set(l,i) atomic_long_set(&(l)->a, (i))
15 16
16static inline void local_inc(local_t *v) 17static inline void local_inc(local_t *l)
17{ 18{
18 __asm__ __volatile__( 19 __asm__ __volatile__(
19 "incq %0" 20 "incq %0"
20 :"=m" (v->counter) 21 :"=m" (l->a.counter)
21 :"m" (v->counter)); 22 :"m" (l->a.counter));
22} 23}
23 24
24static inline void local_dec(local_t *v) 25static inline void local_dec(local_t *l)
25{ 26{
26 __asm__ __volatile__( 27 __asm__ __volatile__(
27 "decq %0" 28 "decq %0"
28 :"=m" (v->counter) 29 :"=m" (l->a.counter)
29 :"m" (v->counter)); 30 :"m" (l->a.counter));
30} 31}
31 32
32static inline void local_add(long i, local_t *v) 33static inline void local_add(long i, local_t *l)
33{ 34{
34 __asm__ __volatile__( 35 __asm__ __volatile__(
35 "addq %1,%0" 36 "addq %1,%0"
36 :"=m" (v->counter) 37 :"=m" (l->a.counter)
37 :"ir" (i), "m" (v->counter)); 38 :"ir" (i), "m" (l->a.counter));
38} 39}
39 40
40static inline void local_sub(long i, local_t *v) 41static inline void local_sub(long i, local_t *l)
41{ 42{
42 __asm__ __volatile__( 43 __asm__ __volatile__(
43 "subq %1,%0" 44 "subq %1,%0"
44 :"=m" (v->counter) 45 :"=m" (l->a.counter)
45 :"ir" (i), "m" (v->counter)); 46 :"ir" (i), "m" (l->a.counter));
46} 47}
47 48
49/**
50 * local_sub_and_test - subtract value from variable and test result
51 * @i: integer value to subtract
52 * @l: pointer to type local_t
53 *
54 * Atomically subtracts @i from @l and returns
55 * true if the result is zero, or false for all
56 * other cases.
57 */
58static __inline__ int local_sub_and_test(long i, local_t *l)
59{
60 unsigned char c;
61
62 __asm__ __volatile__(
63 "subq %2,%0; sete %1"
64 :"=m" (l->a.counter), "=qm" (c)
65 :"ir" (i), "m" (l->a.counter) : "memory");
66 return c;
67}
68
69/**
70 * local_dec_and_test - decrement and test
71 * @l: pointer to type local_t
72 *
73 * Atomically decrements @l by 1 and
74 * returns true if the result is 0, or false for all other
75 * cases.
76 */
77static __inline__ int local_dec_and_test(local_t *l)
78{
79 unsigned char c;
80
81 __asm__ __volatile__(
82 "decq %0; sete %1"
83 :"=m" (l->a.counter), "=qm" (c)
84 :"m" (l->a.counter) : "memory");
85 return c != 0;
86}
87
88/**
89 * local_inc_and_test - increment and test
90 * @l: pointer to type local_t
91 *
92 * Atomically increments @l by 1
93 * and returns true if the result is zero, or false for all
94 * other cases.
95 */
96static __inline__ int local_inc_and_test(local_t *l)
97{
98 unsigned char c;
99
100 __asm__ __volatile__(
101 "incq %0; sete %1"
102 :"=m" (l->a.counter), "=qm" (c)
103 :"m" (l->a.counter) : "memory");
104 return c != 0;
105}
106
107/**
108 * local_add_negative - add and test if negative
109 * @i: integer value to add
110 * @l: pointer to type local_t
111 *
112 * Atomically adds @i to @l and returns true
113 * if the result is negative, or false when
114 * result is greater than or equal to zero.
115 */
116static __inline__ int local_add_negative(long i, local_t *l)
117{
118 unsigned char c;
119
120 __asm__ __volatile__(
121 "addq %2,%0; sets %1"
122 :"=m" (l->a.counter), "=qm" (c)
123 :"ir" (i), "m" (l->a.counter) : "memory");
124 return c;
125}
126
127/**
128 * local_add_return - add and return
129 * @i: integer value to add
130 * @l: pointer to type local_t
131 *
132 * Atomically adds @i to @l and returns @i + @l
133 */
134static __inline__ long local_add_return(long i, local_t *l)
135{
136 long __i = i;
137 __asm__ __volatile__(
138 "xaddq %0, %1;"
139 :"+r" (i), "+m" (l->a.counter)
140 : : "memory");
141 return i + __i;
142}
143
144static __inline__ long local_sub_return(long i, local_t *l)
145{
146 return local_add_return(-i,l);
147}
148
149#define local_inc_return(l) (local_add_return(1,l))
150#define local_dec_return(l) (local_sub_return(1,l))
151
152#define local_cmpxchg(l, o, n) \
153 (cmpxchg_local(&((l)->a.counter), (o), (n)))
154/* Always has a lock prefix */
155#define local_xchg(l, n) (xchg(&((l)->a.counter), (n)))
156
157/**
158 * atomic_up_add_unless - add unless the number is a given value
159 * @l: pointer of type local_t
160 * @a: the amount to add to l...
161 * @u: ...unless l is equal to u.
162 *
163 * Atomically adds @a to @l, so long as it was not @u.
164 * Returns non-zero if @l was not @u, and zero otherwise.
165 */
166#define local_add_unless(l, a, u) \
167({ \
168 long c, old; \
169 c = local_read(l); \
170 for (;;) { \
171 if (unlikely(c == (u))) \
172 break; \
173 old = local_cmpxchg((l), c, c + (a)); \
174 if (likely(old == c)) \
175 break; \
176 c = old; \
177 } \
178 c != (u); \
179})
180#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
181
48/* On x86-64 these are better than the atomic variants on SMP kernels 182/* On x86-64 these are better than the atomic variants on SMP kernels
49 because they dont use a lock prefix. */ 183 because they dont use a lock prefix. */
50#define __local_inc(l) local_inc(l) 184#define __local_inc(l) local_inc(l)
@@ -62,27 +196,27 @@ static inline void local_sub(long i, local_t *v)
62 196
63/* Need to disable preemption for the cpu local counters otherwise we could 197/* Need to disable preemption for the cpu local counters otherwise we could
64 still access a variable of a previous CPU in a non atomic way. */ 198 still access a variable of a previous CPU in a non atomic way. */
65#define cpu_local_wrap_v(v) \ 199#define cpu_local_wrap_v(l) \
66 ({ local_t res__; \ 200 ({ local_t res__; \
67 preempt_disable(); \ 201 preempt_disable(); \
68 res__ = (v); \ 202 res__ = (l); \
69 preempt_enable(); \ 203 preempt_enable(); \
70 res__; }) 204 res__; })
71#define cpu_local_wrap(v) \ 205#define cpu_local_wrap(l) \
72 ({ preempt_disable(); \ 206 ({ preempt_disable(); \
73 v; \ 207 l; \
74 preempt_enable(); }) \ 208 preempt_enable(); }) \
75 209
76#define cpu_local_read(v) cpu_local_wrap_v(local_read(&__get_cpu_var(v))) 210#define cpu_local_read(l) cpu_local_wrap_v(local_read(&__get_cpu_var(l)))
77#define cpu_local_set(v, i) cpu_local_wrap(local_set(&__get_cpu_var(v), (i))) 211#define cpu_local_set(l, i) cpu_local_wrap(local_set(&__get_cpu_var(l), (i)))
78#define cpu_local_inc(v) cpu_local_wrap(local_inc(&__get_cpu_var(v))) 212#define cpu_local_inc(l) cpu_local_wrap(local_inc(&__get_cpu_var(l)))
79#define cpu_local_dec(v) cpu_local_wrap(local_dec(&__get_cpu_var(v))) 213#define cpu_local_dec(l) cpu_local_wrap(local_dec(&__get_cpu_var(l)))
80#define cpu_local_add(i, v) cpu_local_wrap(local_add((i), &__get_cpu_var(v))) 214#define cpu_local_add(i, l) cpu_local_wrap(local_add((i), &__get_cpu_var(l)))
81#define cpu_local_sub(i, v) cpu_local_wrap(local_sub((i), &__get_cpu_var(v))) 215#define cpu_local_sub(i, l) cpu_local_wrap(local_sub((i), &__get_cpu_var(l)))
82 216
83#define __cpu_local_inc(v) cpu_local_inc(v) 217#define __cpu_local_inc(l) cpu_local_inc(l)
84#define __cpu_local_dec(v) cpu_local_dec(v) 218#define __cpu_local_dec(l) cpu_local_dec(l)
85#define __cpu_local_add(i, v) cpu_local_add((i), (v)) 219#define __cpu_local_add(i, l) cpu_local_add((i), (l))
86#define __cpu_local_sub(i, v) cpu_local_sub((i), (v)) 220#define __cpu_local_sub(i, l) cpu_local_sub((i), (l))
87 221
88#endif /* _ARCH_I386_LOCAL_H */ 222#endif /* _ARCH_X8664_LOCAL_H */
diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h
index 213b7fe5d998..1f1c0bf4a5df 100644
--- a/include/asm-x86_64/system.h
+++ b/include/asm-x86_64/system.h
@@ -214,9 +214,45 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
214 return old; 214 return old;
215} 215}
216 216
217static inline unsigned long __cmpxchg_local(volatile void *ptr,
218 unsigned long old, unsigned long new, int size)
219{
220 unsigned long prev;
221 switch (size) {
222 case 1:
223 __asm__ __volatile__("cmpxchgb %b1,%2"
224 : "=a"(prev)
225 : "q"(new), "m"(*__xg(ptr)), "0"(old)
226 : "memory");
227 return prev;
228 case 2:
229 __asm__ __volatile__("cmpxchgw %w1,%2"
230 : "=a"(prev)
231 : "r"(new), "m"(*__xg(ptr)), "0"(old)
232 : "memory");
233 return prev;
234 case 4:
235 __asm__ __volatile__("cmpxchgl %k1,%2"
236 : "=a"(prev)
237 : "r"(new), "m"(*__xg(ptr)), "0"(old)
238 : "memory");
239 return prev;
240 case 8:
241 __asm__ __volatile__("cmpxchgq %1,%2"
242 : "=a"(prev)
243 : "r"(new), "m"(*__xg(ptr)), "0"(old)
244 : "memory");
245 return prev;
246 }
247 return old;
248}
249
217#define cmpxchg(ptr,o,n)\ 250#define cmpxchg(ptr,o,n)\
218 ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ 251 ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
219 (unsigned long)(n),sizeof(*(ptr)))) 252 (unsigned long)(n),sizeof(*(ptr))))
253#define cmpxchg_local(ptr,o,n)\
254 ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
255 (unsigned long)(n),sizeof(*(ptr))))
220 256
221#ifdef CONFIG_SMP 257#ifdef CONFIG_SMP
222#define smp_mb() mb() 258#define smp_mb() mb()