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genirq: Provide an IRQ affinity mask in non-SMP configs
IRQ affinity masks are not allocated in uniprocessor configurations. This requires special case non-SMP code in drivers for irqchips which have per-CPU enable or mask registers. Since IRQ affinity is always the same in a uniprocessor configuration, we can provide a correct affinity mask without allocating one per IRQ. By returning a real cpumask from irq_data_get_affinity_mask even when SMP is disabled, irqchip drivers which iterate over that mask will automatically do the right thing. Signed-off-by: Samuel Holland <samuel@sholland.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220701200056.46555-9-samuel@sholland.org
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1 changed files with 8 additions and 0 deletions
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@ -151,7 +151,9 @@ struct irq_common_data {
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#endif
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void *handler_data;
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struct msi_desc *msi_desc;
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#ifdef CONFIG_SMP
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cpumask_var_t affinity;
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#endif
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#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
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cpumask_var_t effective_affinity;
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#endif
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@ -882,13 +884,19 @@ static inline int irq_data_get_node(struct irq_data *d)
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static inline
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const struct cpumask *irq_data_get_affinity_mask(struct irq_data *d)
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{
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#ifdef CONFIG_SMP
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return d->common->affinity;
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#else
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return cpumask_of(0);
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#endif
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}
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static inline void irq_data_update_affinity(struct irq_data *d,
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const struct cpumask *m)
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{
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#ifdef CONFIG_SMP
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cpumask_copy(d->common->affinity, m);
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#endif
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}
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static inline const struct cpumask *irq_get_affinity_mask(int irq)
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