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/*
 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/module.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	WARN_ON(cpu != 0);
14
15	local_irq_disable();
16	(func)(info);
17	local_irq_enable();
18
19	return 0;
20}
21EXPORT_SYMBOL(smp_call_function_single);