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genirq: Provide generic_handle_domain_irq_safe(). 

commit 509853f9e1 ("genirq: Provide generic_handle_irq_safe()")
addressed the problem of demultiplexing interrupt handlers which are force
threaded on PREEMPT_RT enabled kernels which means that the demultiplexed
handler is invoked with interrupts enabled which triggers a lockdep
warning due to a non-irq safe lock acquisition.

The same problem exists for the irq domain based interrupt handling via
generic_handle_domain_irq() which has been reported against the AMD
pin-ctrl driver.

Provide generic_handle_domain_irq_safe() which can used from any context.

[ tglx: Split the usage sites out and massaged changelog ]

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/YnkfWFzvusFFktSt@linutronix.de
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215954
This commit is contained in:
Sebastian Andrzej Siewior 2022-05-09 16:04:08 +02:00 committed by Thomas Gleixner
parent 521a547ced
commit 6a164c6469
2 changed files with 25 additions and 0 deletions
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1
include/linux/irqdesc.h
View File

@ -169,6 +169,7 @@ int generic_handle_irq_safe(unsigned int irq);
* conversion failed.
*/
int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq);
int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq);
int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq);
#endif

24
kernel/irq/irqdesc.c
View File

@ -705,6 +705,30 @@ int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq)
}
EXPORT_SYMBOL_GPL(generic_handle_domain_irq);
/**
* generic_handle_irq_safe - Invoke the handler for a HW irq belonging
* to a domain from any context.
* @domain: The domain where to perform the lookup
* @hwirq: The HW irq number to convert to a logical one
*
* Returns: 0 on success, a negative value on error.
*
* This function can be called from any context (IRQ or process
* context). If the interrupt is marked as 'enforce IRQ-context only' then
* the function must be invoked from hard interrupt context.
*/
int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq)
{
unsigned long flags;
int ret;
local_irq_save(flags);
ret = handle_irq_desc(irq_resolve_mapping(domain, hwirq));
local_irq_restore(flags);
return ret;
}
EXPORT_SYMBOL_GPL(generic_handle_domain_irq_safe);
/**
* generic_handle_domain_nmi - Invoke the handler for a HW nmi belonging
* to a domain.