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
 
 
 
 
 
 
 
 
 
 
 
39/*
40 * Preemption is disabled here to make sure the cond_func is called under the
41 * same conditions in UP and SMP.
 
 
42 */
43void 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}
56EXPORT_SYMBOL(on_each_cpu_cond_mask);
57
58int 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}
73EXPORT_SYMBOL_GPL(smp_call_on_cpu);

 
 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
10int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
11				int wait)
12{
13	unsigned long flags;
14
15	WARN_ON(cpu != 0);
 
16
17	local_irq_save(flags);
18	func(info);
19	local_irq_restore(flags);
20
21	return 0;
22}
23EXPORT_SYMBOL(smp_call_function_single);
24
25int smp_call_function_single_async(int cpu, struct call_single_data *csd)
26{
27	unsigned long flags;
28
29	local_irq_save(flags);
30	csd->func(csd->info);
31	local_irq_restore(flags);
32	return 0;
33}
34EXPORT_SYMBOL(smp_call_function_single_async);
35
36int on_each_cpu(smp_call_func_t func, void *info, int wait)
37{
38	unsigned long flags;
39
40	local_irq_save(flags);
41	func(info);
42	local_irq_restore(flags);
43	return 0;
44}
45EXPORT_SYMBOL(on_each_cpu);
46
47/*
48 * Note we still need to test the mask even for UP
49 * because we actually can get an empty mask from
50 * code that on SMP might call us without the local
51 * CPU in the mask.
52 */
53void on_each_cpu_mask(const struct cpumask *mask,
54		      smp_call_func_t func, void *info, bool wait)
55{
56	unsigned long flags;
57
58	if (cpumask_test_cpu(0, mask)) {
 
59		local_irq_save(flags);
60		func(info);
61		local_irq_restore(flags);
62	}
 
63}
64EXPORT_SYMBOL(on_each_cpu_mask);
65
66/*
67 * Preemption is disabled here to make sure the cond_func is called under the
68 * same condtions in UP and SMP.
69 */
70void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
71		      smp_call_func_t func, void *info, bool wait,
72		      gfp_t gfp_flags)
73{
74	unsigned long flags;
 
 
 
 
 
 
 
 
 
75
76	preempt_disable();
77	if (cond_func(0, info)) {
78		local_irq_save(flags);
79		func(info);
80		local_irq_restore(flags);
81	}
82	preempt_enable();
83}
84EXPORT_SYMBOL(on_each_cpu_cond);