/*
* The caller of this wants the passed function to run on every cpu. If wait
* is set, wait until all cpus have finished the function before returning.
* The lock is here to protect the call structure.
* You must not call this function with disabled interrupts or from a
* hardware interrupt handler or from a bottom half handler.
*/
int smp_call_function(void (*func)(void *info), void *info, int retry, int wait)
{
unsigned int nr_cpus = atomic_read(&cpus_booted);
int i;
if (nr_cpus < 2)
return 0;
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
spin_lock(&smp_fn_call.lock);
atomic_set(&smp_fn_call.finished, 0);
smp_fn_call.fn = func;
smp_fn_call.data = info;
for (i = 0; i < nr_cpus; i++)
if (i != smp_processor_id())
__smp_call_function(i);
if (wait)
while (atomic_read(&smp_fn_call.finished) != (nr_cpus - 1));
spin_unlock(&smp_fn_call.lock);
return 0;
}
int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
int wait)
{
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
return __smp_call_function(func, info, nonatomic, wait);
}
/*
* smp_call_function - run a function on all other CPUs.
* @func: The function to run. This must be fast and non-blocking.
* @info: An arbitrary pointer to pass to the function.
* @nonatomic: currently unused.
* @wait: If true, wait (atomically) until function has completed on other
* CPUs.
*
* Returns 0 on success, else a negative status code. Does not return until
* remote CPUs are nearly ready to execute func or are or have executed.
*
* You must not call this function with disabled interrupts or from a
* hardware interrupt handler or from a bottom half handler.
* Actually there are a few legal cases, like panic.
*/
int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
int wait)
{
spin_lock(&call_lock);
__smp_call_function(func,info,nonatomic,wait);
spin_unlock(&call_lock);
return 0;
}
static void native_smp_send_stop(void)
{
/* Don't deadlock on the call lock in panic */
int nolock = !spin_trylock(&call_lock);
unsigned long flags;
local_irq_save(flags);
__smp_call_function(stop_this_cpu, NULL, 0, 0);
if (!nolock)
spin_unlock(&call_lock);
disable_local_APIC();
local_irq_restore(flags);
}
void smp_send_stop(void)
{
int nolock = 0;
/* Don't deadlock on the call lock in panic */
if (!spin_trylock(&call_lock)) {
/* ignore locking because we have paniced anyways */
nolock = 1;
}
__smp_call_function(smp_really_stop_cpu, NULL, 0, 0);
if (!nolock)
spin_unlock(&call_lock);
smp_stop_cpu();
}
void smp_send_stop(void)
{
int nolock = 0;
/* Don't deadlock on the call lock in panic */
if (!spin_trylock(&call_lock)) {
udelay(100);
/* ignore locking because we have paniced anyways */
nolock = 1;
}
__smp_call_function(smp_really_stop_cpu, NULL, 1, 0);
if (!nolock)
spin_unlock(&call_lock);
local_irq_disable();
#ifndef CONFIG_XEN
disable_local_APIC();
#endif
local_irq_enable();
}
void smp_send_stop(void)
{
int nolock = 0;
if (reboot_force)
return;
/* Don't deadlock on the call lock in panic */
if (!spin_trylock(&call_lock)) {
/* ignore locking because we have paniced anyways */
nolock = 1;
}
__smp_call_function(smp_really_stop_cpu, NULL, 0, 0);
if (!nolock)
spin_unlock(&call_lock);
local_irq_disable();
disable_local_APIC();
local_irq_enable();
}
int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
int wait)
/*
* [SUMMARY] Run a function on all other CPUs.
* <func> The function to run. This must be fast and non-blocking.
* <info> An arbitrary pointer to pass to the function.
* <nonatomic> currently unused.
* <wait> If true, wait (atomically) until function has completed on other CPUs.
* [RETURNS] 0 on success, else a negative status code. Does not return until
* remote CPUs are nearly ready to execute <<func>> or are or have executed.
*
* You must not call this function with disabled interrupts or from a
* hardware interrupt handler or from a bottom half handler.
*/
{
/* FIXME: get cpu lock with hotplug cpus, or change this to
bitmask. --RR */
if (num_online_cpus() <= 1)
return 0;
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
return __smp_call_function(func, info, wait, MSG_ALL_BUT_SELF);
}
