From f1985002839af80d6c84e9537834a81fb1364d6e Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 20 Oct 2021 09:33:21 +0100 Subject: irqchip: Provide stronger type checking for IRQCHIP_MATCH/IRQCHIP_DECLARE Both IRQCHIP_DECLARE() and IRQCHIP_MATCH() use an underlying of_device_id() structure to encode the matching property and the init callback. However, this callback is stored in as a void * pointer, which obviously defeat any attempt at stronger type checking. Work around this by providing a new macro that builds on top of the __typecheck() primitive, and that can be used to warn when there is a discrepency between the drivers and core code. Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20211020104527.3066268-1-maz@kernel.org --- include/linux/irqchip.h | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) (limited to 'include/linux') diff --git a/include/linux/irqchip.h b/include/linux/irqchip.h index 67351aac65ef..5de0dfc5d64d 100644 --- a/include/linux/irqchip.h +++ b/include/linux/irqchip.h @@ -14,8 +14,15 @@ #include #include #include +#include #include +/* Undefined on purpose */ +extern of_irq_init_cb_t typecheck_irq_init_cb; + +#define typecheck_irq_init_cb(fn) \ + (__typecheck(typecheck_irq_init_cb, &fn) ? fn : fn) + /* * This macro must be used by the different irqchip drivers to declare * the association between their DT compatible string and their @@ -26,14 +33,16 @@ * @compstr: compatible string of the irqchip driver * @fn: initialization function */ -#define IRQCHIP_DECLARE(name, compat, fn) OF_DECLARE_2(irqchip, name, compat, fn) +#define IRQCHIP_DECLARE(name, compat, fn) \ + OF_DECLARE_2(irqchip, name, compat, typecheck_irq_init_cb(fn)) extern int platform_irqchip_probe(struct platform_device *pdev); #define IRQCHIP_PLATFORM_DRIVER_BEGIN(drv_name) \ static const struct of_device_id drv_name##_irqchip_match_table[] = { -#define IRQCHIP_MATCH(compat, fn) { .compatible = compat, .data = fn }, +#define IRQCHIP_MATCH(compat, fn) { .compatible = compat, \ + .data = typecheck_irq_init_cb(fn), }, #define IRQCHIP_PLATFORM_DRIVER_END(drv_name) \ {}, \ -- cgit v1.2.3 From b8419e7be6c6029eee3448fda45f4f9ad340c4ca Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Wed, 20 Oct 2021 11:48:59 -0700 Subject: irqchip: Fix kernel-doc parameter typo for IRQCHIP_DECLARE The documentation refers to "compstr" when we have the parameter named "compat", fix the typo. Signed-off-by: Florian Fainelli Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20211020184859.2705451-14-f.fainelli@gmail.com --- include/linux/irqchip.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/irqchip.h b/include/linux/irqchip.h index 5de0dfc5d64d..7f007b9c23f8 100644 --- a/include/linux/irqchip.h +++ b/include/linux/irqchip.h @@ -30,7 +30,7 @@ extern of_irq_init_cb_t typecheck_irq_init_cb; * * @name: name that must be unique across all IRQCHIP_DECLARE of the * same file. - * @compstr: compatible string of the irqchip driver + * @compat: compatible string of the irqchip driver * @fn: initialization function */ #define IRQCHIP_DECLARE(name, compat, fn) \ -- cgit v1.2.3 From 1ba5478270a5c3a02b08052a3c003c282f2db94a Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 22 Oct 2021 17:49:21 +0200 Subject: irqchip: Fix compile-testing without CONFIG_OF Drivers using the new IRQCHIP_PLATFORM_DRIVER_BEGIN helper fail to link when compile-testing without CONFIG_OF, as that means CONFIG_IRQCHIP is disabled as well: ld.lld: error: undefined symbol: platform_irqchip_probe >>> referenced by irq-meson-gpio.c >>> irqchip/irq-meson-gpio.o:(meson_gpio_intc_driver) in archive drivers/built-in.a >>> referenced by irq-mchp-eic.c >>> irqchip/irq-mchp-eic.o:(mchp_eic_driver) in archive drivers/built-in.a As the drivers are not actually used in this case, just making the reference to this symbol conditional helps avoid the link failure. Fixes: f8410e626569 ("irqchip: Add IRQCHIP_PLATFORM_DRIVER_BEGIN/END and IRQCHIP_MATCH helper macros") Signed-off-by: Arnd Bergmann Reviewed-by: Florian Fainelli Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20211022154927.920491-1-arnd@kernel.org --- include/linux/irqchip.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'include/linux') diff --git a/include/linux/irqchip.h b/include/linux/irqchip.h index 67351aac65ef..29dbe675fc7a 100644 --- a/include/linux/irqchip.h +++ b/include/linux/irqchip.h @@ -39,8 +39,9 @@ static const struct of_device_id drv_name##_irqchip_match_table[] = { {}, \ }; \ MODULE_DEVICE_TABLE(of, drv_name##_irqchip_match_table); \ -static struct platform_driver drv_name##_driver = { \ - .probe = platform_irqchip_probe, \ +static struct platform_driver drv_name##_driver = { \ + .probe = IS_ENABLED(CONFIG_IRQCHIP) ? \ + platform_irqchip_probe : NULL, \ .driver = { \ .name = #drv_name, \ .owner = THIS_MODULE, \ -- cgit v1.2.3 From a1b09501971435ef213251891753afb0d7f3d27a Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Wed, 20 Oct 2021 11:24:06 +0100 Subject: irq: add generic_handle_arch_irq() Several architectures select GENERIC_IRQ_MULTI_HANDLER and branch to handle_arch_irq() without performing any entry accounting. Add a generic wrapper to handle the common irqentry work when invoking handle_arch_irq(). Where an architecture needs to perform some entry accounting itself, it will need to invoke handle_arch_irq() itself. In subsequent patches it will become the responsibilty of the entry code to set the irq regs when entering an IRQ (rather than deferring this to an irqchip handler), so generic_handle_arch_irq() is made to set the irq regs now. This can be redundant in some cases, but is never harmful as saving/restoring the old regs nests safely. Signed-off-by: Mark Rutland Reviewed-by: Marc Zyngier Reviewed-by: Guo Ren Cc: Thomas Gleixner --- include/linux/irq.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/irq.h b/include/linux/irq.h index c8293c817646..988c225eef2d 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -1261,6 +1261,7 @@ int __init set_handle_irq(void (*handle_irq)(struct pt_regs *)); * top-level IRQ handler. */ extern void (*handle_arch_irq)(struct pt_regs *) __ro_after_init; +asmlinkage void generic_handle_arch_irq(struct pt_regs *regs); #else #ifndef set_handle_irq #define set_handle_irq(handle_irq) \ -- cgit v1.2.3 From 0953fb263714e1c8c1c3d395036d9a14310081dd Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Wed, 20 Oct 2021 20:23:09 +0100 Subject: irq: remove handle_domain_{irq,nmi}() Now that entry code handles IRQ entry (including setting the IRQ regs) before calling irqchip code, irqchip code can safely call generic_handle_domain_irq(), and there's no functional reason for it to call handle_domain_irq(). Let's cement this split of responsibility and remove handle_domain_irq() entirely, updating irqchip drivers to call generic_handle_domain_irq(). For consistency, handle_domain_nmi() is similarly removed and replaced with a generic_handle_domain_nmi() function which also does not perform any entry logic. Previously handle_domain_{irq,nmi}() had a WARN_ON() which would fire when they were called in an inappropriate context. So that we can identify similar issues going forward, similar WARN_ON_ONCE() logic is added to the generic_handle_*() functions, and comments are updated for clarity and consistency. Signed-off-by: Mark Rutland Reviewed-by: Marc Zyngier Cc: Thomas Gleixner --- include/linux/irqdesc.h | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) (limited to 'include/linux') diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h index 59aea39785bf..93d270ca0c56 100644 --- a/include/linux/irqdesc.h +++ b/include/linux/irqdesc.h @@ -168,14 +168,7 @@ int generic_handle_irq(unsigned int irq); * conversion failed. */ int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq); - -#ifdef CONFIG_HANDLE_DOMAIN_IRQ -int handle_domain_irq(struct irq_domain *domain, - unsigned int hwirq, struct pt_regs *regs); - -int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq, - struct pt_regs *regs); -#endif +int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq); #endif /* Test to see if a driver has successfully requested an irq */ -- cgit v1.2.3 From 8d15a7295d33538954df2bca6a4011e4311a9cc2 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Thu, 21 Oct 2021 18:04:14 +0100 Subject: genirq: Hide irq_cpu_{on,off}line() behind a deprecated option irq_cpu_{on,off}line() are now only used by the Octeon platform. Make their use conditional on this plaform being enabled, and otherwise hidden away. Signed-off-by: Marc Zyngier Reviewed-by: Florian Fainelli Tested-by: Serge Semin Link: https://lore.kernel.org/r/20211021170414.3341522-4-maz@kernel.org --- include/linux/irq.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/irq.h b/include/linux/irq.h index c8293c817646..0c746d325206 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -524,9 +524,10 @@ struct irq_chip { void (*irq_bus_lock)(struct irq_data *data); void (*irq_bus_sync_unlock)(struct irq_data *data); +#ifdef CONFIG_DEPRECATED_IRQ_CPU_ONOFFLINE void (*irq_cpu_online)(struct irq_data *data); void (*irq_cpu_offline)(struct irq_data *data); - +#endif void (*irq_suspend)(struct irq_data *data); void (*irq_resume)(struct irq_data *data); void (*irq_pm_shutdown)(struct irq_data *data); @@ -606,8 +607,10 @@ struct irqaction; extern int setup_percpu_irq(unsigned int irq, struct irqaction *new); extern void remove_percpu_irq(unsigned int irq, struct irqaction *act); +#ifdef CONFIG_DEPRECATED_IRQ_CPU_ONOFFLINE extern void irq_cpu_online(void); extern void irq_cpu_offline(void); +#endif extern int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *cpumask, bool force); extern int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info); -- cgit v1.2.3