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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
12int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
13 int wait)
14{
15 unsigned long flags;
16
17 WARN_ON(cpu != 0);
18
19 local_irq_save(flags);
20 func(info);
21 local_irq_restore(flags);
22
23 return 0;
24}
25EXPORT_SYMBOL(smp_call_function_single);
26
27int smp_call_function_single_async(int cpu, call_single_data_t *csd)
28{
29 unsigned long flags;
30
31 local_irq_save(flags);
32 csd->func(csd->info);
33 local_irq_restore(flags);
34 return 0;
35}
36EXPORT_SYMBOL(smp_call_function_single_async);
37
38void 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}
46EXPORT_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 */
54void 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}
65EXPORT_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 */
71void on_each_cpu_cond_mask(bool (*cond_func)(int cpu, void *info),
72 smp_call_func_t func, void *info, bool wait,
73 gfp_t gfp_flags, 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}
85EXPORT_SYMBOL(on_each_cpu_cond_mask);
86
87void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
88 smp_call_func_t func, void *info, bool wait,
89 gfp_t gfp_flags)
90{
91 on_each_cpu_cond_mask(cond_func, func, info, wait, gfp_flags, NULL);
92}
93EXPORT_SYMBOL(on_each_cpu_cond);
94
95int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
96{
97 int ret;
98
99 if (cpu != 0)
100 return -ENXIO;
101
102 if (phys)
103 hypervisor_pin_vcpu(0);
104 ret = func(par);
105 if (phys)
106 hypervisor_pin_vcpu(-1);
107
108 return ret;
109}
110EXPORT_SYMBOL_GPL(smp_call_on_cpu);
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
12int 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}
26EXPORT_SYMBOL(smp_call_function_single);
27
28int 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}
37EXPORT_SYMBOL(smp_call_function_single_async);
38
39void 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}
47EXPORT_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 */
55void 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}
66EXPORT_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 */
72void 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}
85EXPORT_SYMBOL(on_each_cpu_cond_mask);
86
87void 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}
92EXPORT_SYMBOL(on_each_cpu_cond);
93
94int 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}
109EXPORT_SYMBOL_GPL(smp_call_on_cpu);