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[ARM] 4813/1: Add SMP helper functions for clockevents support 

This patch adds the smp_call_function_single and smp_timer_broadcast
functions and modifies ipi_timer to call the platform-specific function
local_timer_interrupt.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2008-02-04 17:28:56 +01:00 committed by Russell King
parent ae30ceac3c
commit 3e45999096
2 changed files with 37 additions and 2 deletions
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29
arch/arm/kernel/smp.c
View File

@ -454,6 +454,27 @@ int smp_call_function(void (*func)(void *info), void *info, int retry,
}
EXPORT_SYMBOL_GPL(smp_call_function);
int smp_call_function_single(int cpu, void (*func)(void *info), void *info,
int retry, int wait)
{
/* prevent preemption and reschedule on another processor */
int current_cpu = get_cpu();
int ret = 0;
if (cpu == current_cpu) {
local_irq_disable();
func(info);
local_irq_enable();
} else
ret = smp_call_function_on_cpu(func, info, retry, wait,
cpumask_of_cpu(cpu));
put_cpu();
return ret;
}
EXPORT_SYMBOL_GPL(smp_call_function_single);
void show_ipi_list(struct seq_file *p)
{
unsigned int cpu;
@ -481,8 +502,7 @@ void show_local_irqs(struct seq_file *p)
static void ipi_timer(void)
{
irq_enter();
profile_tick(CPU_PROFILING);
update_process_times(user_mode(get_irq_regs()));
local_timer_interrupt();
irq_exit();
}
@ -621,6 +641,11 @@ void smp_send_timer(void)
send_ipi_message(mask, IPI_TIMER);
}
void smp_timer_broadcast(cpumask_t mask)
{
send_ipi_message(mask, IPI_TIMER);
}
void smp_send_stop(void)
{
cpumask_t mask = cpu_online_map;

10
include/asm-arm/smp.h
View File

@ -60,6 +60,11 @@ extern void smp_cross_call(cpumask_t callmap);
*/
extern void smp_send_timer(void);
/*
* Broadcast a clock event to other CPUs.
*/
extern void smp_timer_broadcast(cpumask_t mask);
/*
* Boot a secondary CPU, and assign it the specified idle task.
* This also gives us the initial stack to use for this CPU.
@ -96,6 +101,11 @@ extern void platform_cpu_die(unsigned int cpu);
extern int platform_cpu_kill(unsigned int cpu);
extern void platform_cpu_enable(unsigned int cpu);
/*
* Local timer interrupt handling function (can be IPI'ed).
*/
extern void local_timer_interrupt(void);
#ifdef CONFIG_LOCAL_TIMERS
/*
* Setup a local timer interrupt for a CPU.