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