From e1c054918c6c7a30a35d2c183ed86600a071cdab Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 12 May 2021 16:18:15 +0100 Subject: [PATCH] genirq: Move non-irqdomain handle_domain_irq() handling into ARM's handle_IRQ() Despite the name, handle_domain_irq() deals with non-irqdomain handling for the sake of a handful of legacy ARM platforms. Move such handling into ARM's handle_IRQ(), allowing for better code generation for everyone else. This allows us get rid of some complexity, and to rearrange the guards on the various helpers in a more logical way. Signed-off-by: Marc Zyngier --- arch/arm/kernel/irq.c | 22 +++++++++++++++++++++- include/linux/irqdesc.h | 14 ++++---------- kernel/irq/irqdesc.c | 30 ++++++++---------------------- 3 files changed, 33 insertions(+), 33 deletions(-) diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c index 698b6f636156..20ab1e607522 100644 --- a/arch/arm/kernel/irq.c +++ b/arch/arm/kernel/irq.c @@ -63,7 +63,27 @@ int arch_show_interrupts(struct seq_file *p, int prec) */ void handle_IRQ(unsigned int irq, struct pt_regs *regs) { - __handle_domain_irq(NULL, irq, false, regs); + struct pt_regs *old_regs = set_irq_regs(regs); + struct irq_desc *desc; + + irq_enter(); + + /* + * Some hardware gives randomly wrong interrupts. Rather + * than crashing, do something sensible. + */ + if (unlikely(!irq || irq >= nr_irqs)) + desc = NULL; + else + desc = irq_to_desc(irq); + + if (likely(desc)) + handle_irq_desc(desc); + else + ack_bad_irq(irq); + + irq_exit(); + set_irq_regs(old_regs); } /* diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h index 0f226c6b0c70..59aea39785bf 100644 --- a/include/linux/irqdesc.h +++ b/include/linux/irqdesc.h @@ -161,24 +161,18 @@ static inline void generic_handle_irq_desc(struct irq_desc *desc) int handle_irq_desc(struct irq_desc *desc); int generic_handle_irq(unsigned int irq); -#ifdef CONFIG_HANDLE_DOMAIN_IRQ +#ifdef CONFIG_IRQ_DOMAIN /* * Convert a HW interrupt number to a logical one using a IRQ domain, * and handle the result interrupt number. Return -EINVAL if * conversion failed. */ -int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq, - bool lookup, struct pt_regs *regs); - int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq); -static inline int handle_domain_irq(struct irq_domain *domain, - unsigned int hwirq, struct pt_regs *regs) -{ - return __handle_domain_irq(domain, hwirq, true, regs); -} +#ifdef CONFIG_HANDLE_DOMAIN_IRQ +int handle_domain_irq(struct irq_domain *domain, + unsigned int hwirq, struct pt_regs *regs); -#ifdef CONFIG_IRQ_DOMAIN int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq, struct pt_regs *regs); #endif diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 6179d5bde88e..f4dd5186858a 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -659,7 +659,7 @@ int generic_handle_irq(unsigned int irq) } EXPORT_SYMBOL_GPL(generic_handle_irq); -#ifdef CONFIG_HANDLE_DOMAIN_IRQ +#ifdef CONFIG_IRQ_DOMAIN /** * generic_handle_domain_irq - Invoke the handler for a HW irq belonging * to a domain, usually for a non-root interrupt @@ -676,9 +676,10 @@ int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq) } EXPORT_SYMBOL_GPL(generic_handle_domain_irq); +#ifdef CONFIG_HANDLE_DOMAIN_IRQ /** - * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain, - * usually for a root interrupt controller + * handle_domain_irq - Invoke the handler for a HW irq belonging to a domain, + * usually for a root interrupt controller * @domain: The domain where to perform the lookup * @hwirq: The HW irq number to convert to a logical one * @lookup: Whether to perform the domain lookup or not @@ -686,8 +687,8 @@ EXPORT_SYMBOL_GPL(generic_handle_domain_irq); * * Returns: 0 on success, or -EINVAL if conversion has failed */ -int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq, - bool lookup, struct pt_regs *regs) +int handle_domain_irq(struct irq_domain *domain, + unsigned int hwirq, struct pt_regs *regs) { struct pt_regs *old_regs = set_irq_regs(regs); struct irq_desc *desc; @@ -695,22 +696,8 @@ int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq, irq_enter(); - if (likely(IS_ENABLED(CONFIG_IRQ_DOMAIN) && lookup)) { - /* The irqdomain code provides boundary checks */ - desc = irq_resolve_mapping(domain, hwirq); - } else { - /* - * Some hardware gives randomly wrong interrupts. Rather - * than crashing, do something sensible. - */ - if (unlikely(!hwirq || hwirq >= nr_irqs)) { - ack_bad_irq(hwirq); - desc = NULL; - } else { - desc = irq_to_desc(hwirq); - } - } - + /* The irqdomain code provides boundary checks */ + desc = irq_resolve_mapping(domain, hwirq); if (likely(desc)) handle_irq_desc(desc); else @@ -721,7 +708,6 @@ int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq, 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 -- 2.11.0