2019-05-19 12:08:55 +00:00
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// SPDX-License-Identifier: GPL-2.0-only
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2009-01-09 20:27:08 +00:00
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/*
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* Uniprocessor-only support functions. The counterpart to kernel/smp.c
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*/
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2009-01-12 15:04:37 +00:00
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#include <linux/interrupt.h>
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2009-01-09 20:27:08 +00:00
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#include <linux/kernel.h>
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2011-05-23 18:51:41 +00:00
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#include <linux/export.h>
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2009-01-09 20:27:08 +00:00
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#include <linux/smp.h>
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2016-08-29 06:48:43 +00:00
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#include <linux/hypervisor.h>
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2009-01-09 20:27:08 +00:00
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int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
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int wait)
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{
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2013-09-11 21:23:25 +00:00
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unsigned long flags;
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2020-02-05 14:34:09 +00:00
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if (cpu != 0)
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return -ENXIO;
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2009-01-11 04:15:21 +00:00
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2013-09-11 21:23:25 +00:00
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local_irq_save(flags);
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func(info);
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local_irq_restore(flags);
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2009-01-11 04:15:21 +00:00
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2009-01-09 20:27:08 +00:00
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return 0;
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}
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EXPORT_SYMBOL(smp_call_function_single);
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2013-09-11 21:23:24 +00:00
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2021-05-05 21:12:42 +00:00
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int smp_call_function_single_async(int cpu, struct __call_single_data *csd)
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2013-11-14 22:32:08 +00:00
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{
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unsigned long flags;
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local_irq_save(flags);
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csd->func(csd->info);
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local_irq_restore(flags);
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2014-02-24 15:39:57 +00:00
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return 0;
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2013-11-14 22:32:08 +00:00
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}
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2014-02-24 15:40:02 +00:00
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EXPORT_SYMBOL(smp_call_function_single_async);
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2013-11-14 22:32:08 +00:00
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2013-09-11 21:23:24 +00:00
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/*
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* Preemption is disabled here to make sure the cond_func is called under the
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2021-05-07 01:06:33 +00:00
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* same conditions in UP and SMP.
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2013-09-11 21:23:24 +00:00
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*/
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2020-01-17 09:01:35 +00:00
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void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func,
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2020-01-17 09:01:37 +00:00
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void *info, bool wait, const struct cpumask *mask)
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2013-09-11 21:23:24 +00:00
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{
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unsigned long flags;
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preempt_disable();
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2021-02-20 23:17:12 +00:00
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if ((!cond_func || cond_func(0, info)) && cpumask_test_cpu(0, mask)) {
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2013-09-11 21:23:24 +00:00
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local_irq_save(flags);
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func(info);
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local_irq_restore(flags);
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}
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preempt_enable();
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}
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2018-09-26 03:58:41 +00:00
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EXPORT_SYMBOL(on_each_cpu_cond_mask);
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2016-08-29 06:48:44 +00:00
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int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
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{
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int ret;
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if (cpu != 0)
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return -ENXIO;
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if (phys)
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hypervisor_pin_vcpu(0);
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ret = func(par);
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if (phys)
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hypervisor_pin_vcpu(-1);
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return ret;
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}
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EXPORT_SYMBOL_GPL(smp_call_on_cpu);
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