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/*
* xen/common/smp.c
*
* Generic SMP function
*
* Copyright (c) 2013 Citrix Systems.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <asm/hardirq.h>
#include <asm/processor.h>
#include <xen/spinlock.h>
#include <xen/smp.h>
/*
* Structure and data for smp_call_function()/on_selected_cpus().
*/
static DEFINE_SPINLOCK(call_lock);
static struct call_data_struct {
void (*func) (void *info);
void *info;
int wait;
cpumask_t selected;
} call_data;
void smp_call_function(
void (*func) (void *info),
void *info,
int wait)
{
cpumask_t allbutself;
cpumask_andnot(&allbutself, &cpu_online_map,
cpumask_of(smp_processor_id()));
on_selected_cpus(&allbutself, func, info, wait);
}
void on_selected_cpus(
const cpumask_t *selected,
void (*func) (void *info),
void *info,
int wait)
{
unsigned int nr_cpus;
ASSERT(local_irq_is_enabled());
spin_lock(&call_lock);
cpumask_copy(&call_data.selected, selected);
nr_cpus = cpumask_weight(&call_data.selected);
if ( nr_cpus == 0 )
goto out;
call_data.func = func;
call_data.info = info;
call_data.wait = wait;
smp_send_call_function_mask(&call_data.selected);
while ( !cpumask_empty(&call_data.selected) )
cpu_relax();
out:
spin_unlock(&call_lock);
}
void smp_call_function_interrupt(void)
{
void (*func)(void *info) = call_data.func;
void *info = call_data.info;
unsigned int cpu = smp_processor_id();
if ( !cpumask_test_cpu(cpu, &call_data.selected) )
return;
irq_enter();
if ( call_data.wait )
{
(*func)(info);
smp_mb();
cpumask_clear_cpu(cpu, &call_data.selected);
}
else
{
smp_mb();
cpumask_clear_cpu(cpu, &call_data.selected);
(*func)(info);
}
irq_exit();
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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