// SPDX-License-Identifier: GPL-2.0-only
/*
 * Uniprocessor-only support functions.  The counterpart to kernel/smp.c
 */

#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/smp.h>
#include <linux/hypervisor.h>

int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
                                int wait)
{
        unsigned long flags;

        if (cpu != 0)
                return -ENXIO;

        local_irq_save(flags);
        func(info);
        local_irq_restore(flags);

        return 0;
}
EXPORT_SYMBOL(smp_call_function_single);

int smp_call_function_single_async(int cpu, call_single_data_t *csd)
{
        unsigned long flags;

        local_irq_save(flags);
        csd->func(csd->info);
        local_irq_restore(flags);
        return 0;
}
EXPORT_SYMBOL(smp_call_function_single_async);

/*
 * Preemption is disabled here to make sure the cond_func is called under the
 * same conditions in UP and SMP.
 */
void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func,
                           void *info, bool wait, const struct cpumask *mask)
{
        unsigned long flags;

        preempt_disable();
        if ((!cond_func || cond_func(0, info)) && cpumask_test_cpu(0, mask)) {
                local_irq_save(flags);
                func(info);
                local_irq_restore(flags);
        }
        preempt_enable();
}
EXPORT_SYMBOL(on_each_cpu_cond_mask);

int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
{
        int ret;

        if (cpu != 0)
                return -ENXIO;

        if (phys)
                hypervisor_pin_vcpu(0);
        ret = func(par);
        if (phys)
                hypervisor_pin_vcpu(-1);

        return ret;
}
EXPORT_SYMBOL_GPL(smp_call_on_cpu);