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genirq: Introduce irq_can_move_in_process_context()

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Interrupt controller drivers which enable CONFIG_GENERIC_PENDING_IRQ
require to know whether an interrupt can be moved in process context or not
to decide whether they need to invoke the work around for non-atomic MSI
updates or not.

This information can be retrieved via irq_can_move_pcntxt(). That helper
requires access to the top-most interrupt domain data, but the driver which
requires this is usually further down in the hierarchy.

Introduce irq_can_move_in_process_context() which retrieves that
information from the top-most interrupt domain data.

[ tglx: Massaged change log ]

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250217085657.789309-6-apatel@ventanamicro.com
This commit is contained in:
Anup Patel 2025-02-17 14:26:51 +05:30 • committed by Thomas Gleixner
parent 751dc837da
commit e54b1b5e89
2 changed files with 12 additions and 0 deletions
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2
include/linux/irq.h
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@ -615,6 +615,7 @@ extern int irq_affinity_online_cpu(unsigned int cpu);
#endif
#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
bool irq_can_move_in_process_context(struct irq_data *data);
void __irq_move_irq(struct irq_data *data);
static inline void irq_move_irq(struct irq_data *data)
{
@ -623,6 +624,7 @@ static inline void irq_move_irq(struct irq_data *data)
}
void irq_move_masked_irq(struct irq_data *data);
#else
static inline bool irq_can_move_in_process_context(struct irq_data *data) { return true; }
static inline void irq_move_irq(struct irq_data *data) { }
static inline void irq_move_masked_irq(struct irq_data *data) { }
#endif

10
kernel/irq/migration.c
View file

@ -127,3 +127,13 @@ void __irq_move_irq(struct irq_data *idata)
if (!masked)
idata->chip->irq_unmask(idata);
}
bool irq_can_move_in_process_context(struct irq_data *data)
{
/*
* Get the top level irq_data in the hierarchy, which is optimized
* away when CONFIG_IRQ_DOMAIN_HIERARCHY is disabled.
*/
data = irq_desc_get_irq_data(irq_data_to_desc(data));
return irq_can_move_pcntxt(data);
}