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[ARM SMP] Add core ARM support for local timers

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Add infrastructure for supporting per-cpu local timers to update
the profiling information and update system time accounting.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2005-11-08 19:08:05 +00:00
committed by Russell King
parent 3b6353fae0
commit 37ee16ae93
6 changed files with 91 additions and 0 deletions
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7
arch/arm/kernel/entry-armv.S
View File

@@ -47,6 +47,13 @@
movne r0, sp
adrne lr, 1b
bne do_IPI
#ifdef CONFIG_LOCAL_TIMERS
test_for_ltirq r0, r6, r5, lr
movne r0, sp
adrne lr, 1b
bne do_local_timer
#endif
#endif
.endm

1
arch/arm/kernel/irq.c
View File

@@ -264,6 +264,7 @@ unlock:
#endif
#ifdef CONFIG_SMP
show_ipi_list(p);
show_local_irqs(p);
#endif
seq_printf(p, "Err: %10lu\n", irq_err_count);
}

34
arch/arm/kernel/smp.c
View File

@@ -184,6 +184,11 @@ int __cpuexit __cpu_disable(void)
*/
migrate_irqs();
/*
* Stop the local timer for this CPU.
*/
local_timer_stop(cpu);
/*
* Flush user cache and TLB mappings, and then remove this CPU
* from the vm mask set of all processes.
@@ -289,6 +294,11 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
*/
cpu_set(cpu, cpu_online_map);
/*
* Setup local timer for this CPU.
*/
local_timer_setup(cpu);
/*
* OK, it's off to the idle thread for us
*/
@@ -454,6 +464,18 @@ void show_ipi_list(struct seq_file *p)
seq_putc(p, '\n');
}
void show_local_irqs(struct seq_file *p)
{
unsigned int cpu;
seq_printf(p, "LOC: ");
for_each_present_cpu(cpu)
seq_printf(p, "%10u ", irq_stat[cpu].local_timer_irqs);
seq_putc(p, '\n');
}
static void ipi_timer(struct pt_regs *regs)
{
int user = user_mode(regs);
@@ -464,6 +486,18 @@ static void ipi_timer(struct pt_regs *regs)
irq_exit();
}
#ifdef CONFIG_LOCAL_TIMERS
asmlinkage void do_local_timer(struct pt_regs *regs)
{
int cpu = smp_processor_id();
if (local_timer_ack()) {
irq_stat[cpu].local_timer_irqs++;
ipi_timer(regs);
}
}
#endif
/*
* ipi_call_function - handle IPI from smp_call_function()
*