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irqdesc: Add domain handler for NMIs 

NMI handling code should be executed between calls to nmi_enter and
nmi_exit.

Add a separate domain handler to properly setup NMI context when handling
an interrupt requested as NMI.

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Julien Thierry 2019-01-31 14:54:01 +00:00 committed by Marc Zyngier
parent 2dcf1fbcad
commit 6e4933a006
2 changed files with 40 additions and 0 deletions
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5
include/linux/irqdesc.h
View File

@ -171,6 +171,11 @@ static inline int handle_domain_irq(struct irq_domain *domain,
{
return __handle_domain_irq(domain, hwirq, true, regs);
}
#ifdef CONFIG_IRQ_DOMAIN
int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq,
struct pt_regs *regs);
#endif
#endif
/* Test to see if a driver has successfully requested an irq */

35
kernel/irq/irqdesc.c
View File

@ -669,6 +669,41 @@ int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
set_irq_regs(old_regs);
return ret;
}
#ifdef CONFIG_IRQ_DOMAIN
/**
* handle_domain_nmi - Invoke the handler for a HW irq belonging to a domain
* @domain: The domain where to perform the lookup
* @hwirq: The HW irq number to convert to a logical one
* @regs: Register file coming from the low-level handling code
*
* Returns: 0 on success, or -EINVAL if conversion has failed
*/
int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq,
struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
unsigned int irq;
int ret = 0;
nmi_enter();
irq = irq_find_mapping(domain, hwirq);
/*
* ack_bad_irq is not NMI-safe, just report
* an invalid interrupt.
*/
if (likely(irq))
generic_handle_irq(irq);
else
ret = -EINVAL;
nmi_exit();
set_irq_regs(old_regs);
return ret;
}
#endif
#endif
/* Dynamic interrupt handling */