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SubjectRe: [PATCH 11/12] irqchip/mips-gic: Report that effective affinity is a single target
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Hi Marc,

On Tuesday, 15 August 2017 04:34:46 PDT Marc Zyngier wrote:
> The MIPS GIC driver only targets a single CPU at a time, even if
> the notional affinity is wider. Let's inform the core code
> about this.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
> drivers/irqchip/Kconfig | 1 +
> drivers/irqchip/irq-mips-gic.c | 2 ++
> 2 files changed, 3 insertions(+)
>
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index 39bfa5b25b54..bca9a88012f0 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -141,6 +141,7 @@ config IRQ_MIPS_CPU
> select GENERIC_IRQ_IPI if SYS_SUPPORTS_MULTITHREADING
> select IRQ_DOMAIN
> select IRQ_DOMAIN_HIERARCHY if GENERIC_IRQ_IPI
> + select GENERIC_IRQ_EFFECTIVE_AFF_MASK
>
> config CLPS711X_IRQCHIP
> bool
> diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
> index 6ab1d3afec02..e075cb25fad6 100644
> --- a/drivers/irqchip/irq-mips-gic.c
> +++ b/drivers/irqchip/irq-mips-gic.c
> @@ -463,6 +463,7 @@ static int gic_set_affinity(struct irq_data *d, const
> struct cpumask *cpumask, set_bit(irq,
> pcpu_masks[cpumask_first(&tmp)].pcpu_mask);
>
> cpumask_copy(irq_data_get_affinity_mask(d), cpumask);
> + irq_data_update_effective_affinity(d, cpumask);

This doesn't seem right - it's just setting the effective affinity to the same
as affinity, not taking into account CPU restrictions at all. I think this
should be:

irq_data_update_effective_affinity(d, cpumask_of(cpumask_first(&tmp)));

(or something cleaner but to that effect)

Thanks,
Paul

> spin_unlock_irqrestore(&gic_lock, flags);
>
> return IRQ_SET_MASK_OK_NOCOPY;
> @@ -716,6 +717,7 @@ static int gic_irq_domain_map(struct irq_domain *d,
> unsigned int virq, if (err)
> return err;
>
> + irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
> return gic_shared_irq_domain_map(d, virq, hwirq, 0);
> }

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