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1 | // SPDX-License-Identifier: GPL-2.0-only | |
2 | /* | |
3 | * Uniprocessor-only support functions. The counterpart to kernel/smp.c | |
4 | */ | |
5 | ||
6 | #include <linux/interrupt.h> | |
7 | #include <linux/kernel.h> | |
8 | #include <linux/export.h> | |
9 | #include <linux/smp.h> | |
10 | #include <linux/hypervisor.h> | |
11 | ||
12 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info, | |
13 | int wait) | |
14 | { | |
15 | unsigned long flags; | |
16 | ||
17 | if (cpu != 0) | |
18 | return -ENXIO; | |
19 | ||
20 | local_irq_save(flags); | |
21 | func(info); | |
22 | local_irq_restore(flags); | |
23 | ||
24 | return 0; | |
25 | } | |
26 | EXPORT_SYMBOL(smp_call_function_single); | |
27 | ||
28 | int smp_call_function_single_async(int cpu, call_single_data_t *csd) | |
29 | { | |
30 | unsigned long flags; | |
31 | ||
32 | local_irq_save(flags); | |
33 | csd->func(csd->info); | |
34 | local_irq_restore(flags); | |
35 | return 0; | |
36 | } | |
37 | EXPORT_SYMBOL(smp_call_function_single_async); | |
38 | ||
39 | void on_each_cpu(smp_call_func_t func, void *info, int wait) | |
40 | { | |
41 | unsigned long flags; | |
42 | ||
43 | local_irq_save(flags); | |
44 | func(info); | |
45 | local_irq_restore(flags); | |
46 | } | |
47 | EXPORT_SYMBOL(on_each_cpu); | |
48 | ||
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 | */ | |
72 | void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func, | |
73 | void *info, bool wait, const struct cpumask *mask) | |
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_mask); | |
86 | ||
87 | void on_each_cpu_cond(smp_cond_func_t cond_func, smp_call_func_t func, | |
88 | void *info, bool wait) | |
89 | { | |
90 | on_each_cpu_cond_mask(cond_func, func, info, wait, NULL); | |
91 | } | |
92 | EXPORT_SYMBOL(on_each_cpu_cond); | |
93 | ||
94 | int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys) | |
95 | { | |
96 | int ret; | |
97 | ||
98 | if (cpu != 0) | |
99 | return -ENXIO; | |
100 | ||
101 | if (phys) | |
102 | hypervisor_pin_vcpu(0); | |
103 | ret = func(par); | |
104 | if (phys) | |
105 | hypervisor_pin_vcpu(-1); | |
106 | ||
107 | return ret; | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(smp_call_on_cpu); |