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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
This commit is contained in:
Samuel Holland 2022-07-01 15:00:56 -05:00 committed by Marc Zyngier
parent 4d0b829881
commit aa0813581b
1 changed files with 8 additions and 0 deletions
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8
include/linux/irq.h
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@ -151,7 +151,9 @@ struct irq_common_data {
#endif
void *handler_data;
struct msi_desc *msi_desc;
#ifdef CONFIG_SMP
cpumask_var_t affinity;
#endif
#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
cpumask_var_t effective_affinity;
#endif
@ -882,13 +884,19 @@ static inline int irq_data_get_node(struct irq_data *d)
static inline
const struct cpumask *irq_data_get_affinity_mask(struct irq_data *d)
{
#ifdef CONFIG_SMP
return d->common->affinity;
#else
return cpumask_of(0);
#endif
}
static inline void irq_data_update_affinity(struct irq_data *d,
const struct cpumask *m)
{
#ifdef CONFIG_SMP
cpumask_copy(d->common->affinity, m);
#endif
}
static inline const struct cpumask *irq_get_affinity_mask(int irq)