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 /*
40 * Preemption is disabled here to make sure the cond_func is called under the
41 * same conditions in UP and SMP.
42 */
43 void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func,
44 void *info, bool wait, const struct cpumask *mask)
45 {
46 unsigned long flags;
47
48 preempt_disable();
49 if ((!cond_func || cond_func(0, info)) && cpumask_test_cpu(0, mask)) {
50 local_irq_save(flags);
51 func(info);
52 local_irq_restore(flags);
53 }
54 preempt_enable();
55 }
56 EXPORT_SYMBOL(on_each_cpu_cond_mask);
57
58 int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
59 {
60 int ret;
61
62 if (cpu != 0)
63 return -ENXIO;
64
65 if (phys)
66 hypervisor_pin_vcpu(0);
67 ret = func(par);
68 if (phys)
69 hypervisor_pin_vcpu(-1);
70
71 return ret;
72 }
73 EXPORT_SYMBOL_GPL(smp_call_on_cpu);
74
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