Commit e54b1b5e authored by Anup Patel's avatar Anup Patel Committed by Thomas Gleixner
Browse files

genirq: Introduce irq_can_move_in_process_context() 



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: default avatarAnup Patel <apatel@ventanamicro.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250217085657.789309-6-apatel@ventanamicro.com
parent 751dc837

include/linux/irq.h

+2 −0
Original line number Diff line number Diff line
@@ -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

kernel/irq/migration.c

+10 −0
Original line number Diff line number Diff line
@@ -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);

}