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Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
53ce3d95 AM |
2 | /* |
3 | * Uniprocessor-only support functions. The counterpart to kernel/smp.c | |
4 | */ | |
5 | ||
6e962814 | 6 | #include <linux/interrupt.h> |
53ce3d95 | 7 | #include <linux/kernel.h> |
9984de1a | 8 | #include <linux/export.h> |
53ce3d95 | 9 | #include <linux/smp.h> |
47ae4b05 | 10 | #include <linux/hypervisor.h> |
53ce3d95 AM |
11 | |
12 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info, | |
13 | int wait) | |
14 | { | |
081192b2 DD |
15 | unsigned long flags; |
16 | ||
93423b86 IM |
17 | WARN_ON(cpu != 0); |
18 | ||
081192b2 DD |
19 | local_irq_save(flags); |
20 | func(info); | |
21 | local_irq_restore(flags); | |
93423b86 | 22 | |
53ce3d95 AM |
23 | return 0; |
24 | } | |
25 | EXPORT_SYMBOL(smp_call_function_single); | |
fa688207 | 26 | |
966a9671 | 27 | int smp_call_function_single_async(int cpu, call_single_data_t *csd) |
40c01e8b CH |
28 | { |
29 | unsigned long flags; | |
30 | ||
31 | local_irq_save(flags); | |
32 | csd->func(csd->info); | |
33 | local_irq_restore(flags); | |
08eed44c | 34 | return 0; |
40c01e8b | 35 | } |
c46fff2a | 36 | EXPORT_SYMBOL(smp_call_function_single_async); |
40c01e8b | 37 | |
bff2dc42 DD |
38 | int on_each_cpu(smp_call_func_t func, void *info, int wait) |
39 | { | |
40 | unsigned long flags; | |
41 | ||
42 | local_irq_save(flags); | |
43 | func(info); | |
44 | local_irq_restore(flags); | |
45 | return 0; | |
46 | } | |
47 | EXPORT_SYMBOL(on_each_cpu); | |
48 | ||
fa688207 DD |
49 | /* |
50 | * Note we still need to test the mask even for UP | |
51 | * because we actually can get an empty mask from | |
52 | * code that on SMP might call us without the local | |
53 | * CPU in the mask. | |
54 | */ | |
55 | void on_each_cpu_mask(const struct cpumask *mask, | |
56 | smp_call_func_t func, void *info, bool wait) | |
57 | { | |
58 | unsigned long flags; | |
59 | ||
60 | if (cpumask_test_cpu(0, mask)) { | |
61 | local_irq_save(flags); | |
62 | func(info); | |
63 | local_irq_restore(flags); | |
64 | } | |
65 | } | |
66 | EXPORT_SYMBOL(on_each_cpu_mask); | |
67 | ||
68 | /* | |
69 | * Preemption is disabled here to make sure the cond_func is called under the | |
70 | * same condtions in UP and SMP. | |
71 | */ | |
7d49b28a RR |
72 | void on_each_cpu_cond_mask(bool (*cond_func)(int cpu, void *info), |
73 | smp_call_func_t func, void *info, bool wait, | |
74 | gfp_t gfp_flags, const struct cpumask *mask) | |
fa688207 DD |
75 | { |
76 | unsigned long flags; | |
77 | ||
78 | preempt_disable(); | |
79 | if (cond_func(0, info)) { | |
80 | local_irq_save(flags); | |
81 | func(info); | |
82 | local_irq_restore(flags); | |
83 | } | |
84 | preempt_enable(); | |
85 | } | |
7d49b28a RR |
86 | EXPORT_SYMBOL(on_each_cpu_cond_mask); |
87 | ||
88 | void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), | |
89 | smp_call_func_t func, void *info, bool wait, | |
90 | gfp_t gfp_flags) | |
91 | { | |
92 | on_each_cpu_cond_mask(cond_func, func, info, wait, gfp_flags, NULL); | |
93 | } | |
fa688207 | 94 | EXPORT_SYMBOL(on_each_cpu_cond); |
df8ce9d7 JG |
95 | |
96 | int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys) | |
97 | { | |
98 | int ret; | |
99 | ||
100 | if (cpu != 0) | |
101 | return -ENXIO; | |
102 | ||
103 | if (phys) | |
104 | hypervisor_pin_vcpu(0); | |
105 | ret = func(par); | |
106 | if (phys) | |
107 | hypervisor_pin_vcpu(-1); | |
108 | ||
109 | return ret; | |
110 | } | |
111 | EXPORT_SYMBOL_GPL(smp_call_on_cpu); |