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powerpc/ps3: Fix lost SMP IPIs

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Fixes the PS3 bootup hang introduced in 3.0-rc1 by:

  commit 317f394160
  sched: Move the second half of ttwu() to the remote cpu

Move the PS3's LV1 EOI call lv1_end_of_interrupt_ext() from ps3_chip_eoi()
to ps3_get_irq() for IPI messages.

If lv1_send_event_locally() is called between a previous call to
lv1_send_event_locally() and the coresponding call to
lv1_end_of_interrupt_ext() the second event will not be delivered to the
target cpu.

The PS3's SMP IPIs are implemented using lv1_send_event_locally(), so if two
IPI messages of the same type are sent to the same target in a relatively
short period of time the second IPI event can become lost when
lv1_end_of_interrupt_ext() is called from ps3_chip_eoi().

CC: stable@kernel.org
Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Geoff Levand 2011-11-08 12:37:26 +00:00 committed by Benjamin Herrenschmidt
parent de1d9248ea
commit 72f3bea075
3 changed files with 25 additions and 1 deletions
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23
arch/powerpc/platforms/ps3/interrupt.c
View File

@ -88,6 +88,7 @@ struct ps3_private {
struct ps3_bmp bmp __attribute__ ((aligned (PS3_BMP_MINALIGN)));
u64 ppe_id;
u64 thread_id;
unsigned long ipi_mask;
};
static DEFINE_PER_CPU(struct ps3_private, ps3_private);
@ -144,7 +145,11 @@ static void ps3_chip_unmask(struct irq_data *d)
static void ps3_chip_eoi(struct irq_data *d)
{
const struct ps3_private *pd = irq_data_get_irq_chip_data(d);
lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, d->irq);
/* non-IPIs are EOIed here. */
if (!test_bit(63 - d->irq, &pd->ipi_mask))
lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, d->irq);
}
/**
@ -691,6 +696,16 @@ void __init ps3_register_ipi_debug_brk(unsigned int cpu, unsigned int virq)
cpu, virq, pd->bmp.ipi_debug_brk_mask);
}
void __init ps3_register_ipi_irq(unsigned int cpu, unsigned int virq)
{
struct ps3_private *pd = &per_cpu(ps3_private, cpu);
set_bit(63 - virq, &pd->ipi_mask);
DBG("%s:%d: cpu %u, virq %u, ipi_mask %lxh\n", __func__, __LINE__,
cpu, virq, pd->ipi_mask);
}
static unsigned int ps3_get_irq(void)
{
struct ps3_private *pd = &__get_cpu_var(ps3_private);
@ -720,6 +735,12 @@ static unsigned int ps3_get_irq(void)
BUG();
}
#endif
/* IPIs are EOIed here. */
if (test_bit(63 - plug, &pd->ipi_mask))
lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, plug);
return plug;
}

1
arch/powerpc/platforms/ps3/platform.h
View File

@ -43,6 +43,7 @@ void ps3_mm_shutdown(void);
void ps3_init_IRQ(void);
void ps3_shutdown_IRQ(int cpu);
void __init ps3_register_ipi_debug_brk(unsigned int cpu, unsigned int virq);
void __init ps3_register_ipi_irq(unsigned int cpu, unsigned int virq);
/* smp */

2
arch/powerpc/platforms/ps3/smp.c
View File

@ -94,6 +94,8 @@ static void __init ps3_smp_setup_cpu(int cpu)
if (result)
virqs[i] = NO_IRQ;
else
ps3_register_ipi_irq(cpu, virqs[i]);
}
ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);