Merge tag 'xfs-5.13-merge-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
[platform/kernel/linux-starfive.git] / kernel / up.c
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 condtions 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);