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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
c360192b MS |
2 | #ifndef __ASM_PREEMPT_H |
3 | #define __ASM_PREEMPT_H | |
4 | ||
5 | #include <asm/current.h> | |
6 | #include <linux/thread_info.h> | |
7 | #include <asm/atomic_ops.h> | |
8 | ||
9 | #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES | |
10 | ||
11 | #define PREEMPT_ENABLED (0 + PREEMPT_NEED_RESCHED) | |
12 | ||
13 | static inline int preempt_count(void) | |
14 | { | |
15 | return READ_ONCE(S390_lowcore.preempt_count) & ~PREEMPT_NEED_RESCHED; | |
16 | } | |
17 | ||
18 | static inline void preempt_count_set(int pc) | |
19 | { | |
20 | int old, new; | |
21 | ||
22 | do { | |
23 | old = READ_ONCE(S390_lowcore.preempt_count); | |
24 | new = (old & PREEMPT_NEED_RESCHED) | | |
25 | (pc & ~PREEMPT_NEED_RESCHED); | |
26 | } while (__atomic_cmpxchg(&S390_lowcore.preempt_count, | |
27 | old, new) != old); | |
28 | } | |
29 | ||
30 | #define init_task_preempt_count(p) do { } while (0) | |
31 | ||
32 | #define init_idle_preempt_count(p, cpu) do { \ | |
33 | S390_lowcore.preempt_count = PREEMPT_ENABLED; \ | |
34 | } while (0) | |
35 | ||
36 | static inline void set_preempt_need_resched(void) | |
37 | { | |
38 | __atomic_and(~PREEMPT_NEED_RESCHED, &S390_lowcore.preempt_count); | |
39 | } | |
40 | ||
41 | static inline void clear_preempt_need_resched(void) | |
42 | { | |
43 | __atomic_or(PREEMPT_NEED_RESCHED, &S390_lowcore.preempt_count); | |
44 | } | |
45 | ||
46 | static inline bool test_preempt_need_resched(void) | |
47 | { | |
48 | return !(READ_ONCE(S390_lowcore.preempt_count) & PREEMPT_NEED_RESCHED); | |
49 | } | |
50 | ||
51 | static inline void __preempt_count_add(int val) | |
52 | { | |
53 | if (__builtin_constant_p(val) && (val >= -128) && (val <= 127)) | |
54 | __atomic_add_const(val, &S390_lowcore.preempt_count); | |
55 | else | |
56 | __atomic_add(val, &S390_lowcore.preempt_count); | |
57 | } | |
58 | ||
59 | static inline void __preempt_count_sub(int val) | |
60 | { | |
61 | __preempt_count_add(-val); | |
62 | } | |
63 | ||
64 | static inline bool __preempt_count_dec_and_test(void) | |
65 | { | |
66 | return __atomic_add(-1, &S390_lowcore.preempt_count) == 1; | |
67 | } | |
68 | ||
69 | static inline bool should_resched(int preempt_offset) | |
70 | { | |
71 | return unlikely(READ_ONCE(S390_lowcore.preempt_count) == | |
72 | preempt_offset); | |
73 | } | |
74 | ||
75 | #else /* CONFIG_HAVE_MARCH_Z196_FEATURES */ | |
76 | ||
77 | #define PREEMPT_ENABLED (0) | |
78 | ||
79 | static inline int preempt_count(void) | |
80 | { | |
81 | return READ_ONCE(S390_lowcore.preempt_count); | |
82 | } | |
83 | ||
84 | static inline void preempt_count_set(int pc) | |
85 | { | |
86 | S390_lowcore.preempt_count = pc; | |
87 | } | |
88 | ||
89 | #define init_task_preempt_count(p) do { } while (0) | |
90 | ||
91 | #define init_idle_preempt_count(p, cpu) do { \ | |
92 | S390_lowcore.preempt_count = PREEMPT_ENABLED; \ | |
93 | } while (0) | |
94 | ||
95 | static inline void set_preempt_need_resched(void) | |
96 | { | |
97 | } | |
98 | ||
99 | static inline void clear_preempt_need_resched(void) | |
100 | { | |
101 | } | |
102 | ||
103 | static inline bool test_preempt_need_resched(void) | |
104 | { | |
105 | return false; | |
106 | } | |
107 | ||
108 | static inline void __preempt_count_add(int val) | |
109 | { | |
110 | S390_lowcore.preempt_count += val; | |
111 | } | |
112 | ||
113 | static inline void __preempt_count_sub(int val) | |
114 | { | |
115 | S390_lowcore.preempt_count -= val; | |
116 | } | |
117 | ||
118 | static inline bool __preempt_count_dec_and_test(void) | |
119 | { | |
120 | return !--S390_lowcore.preempt_count && tif_need_resched(); | |
121 | } | |
122 | ||
123 | static inline bool should_resched(int preempt_offset) | |
124 | { | |
125 | return unlikely(preempt_count() == preempt_offset && | |
126 | tif_need_resched()); | |
127 | } | |
128 | ||
129 | #endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */ | |
130 | ||
131 | #ifdef CONFIG_PREEMPT | |
132 | extern asmlinkage void preempt_schedule(void); | |
133 | #define __preempt_schedule() preempt_schedule() | |
134 | extern asmlinkage void preempt_schedule_notrace(void); | |
135 | #define __preempt_schedule_notrace() preempt_schedule_notrace() | |
136 | #endif /* CONFIG_PREEMPT */ | |
137 | ||
138 | #endif /* __ASM_PREEMPT_H */ |