genirq: Add CONFIG_GENERIC_IRQ_MULTI_HANDLER
The arm multi irq handler registration mechanism has been copied into a handful of architectures, including arm64 and openrisc. RISC-V needs the same mechanism. Instead of adding yet another copy for RISC-V copy the arm implementation into the core code depending on a new Kconfig symbol: CONFIG_GENERIC_MULTI_IRQ_HANDLER. Subsequent patches will convert the various architectures. Signed-off-by: Palmer Dabbelt <palmer@sifive.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: jonas@southpole.se Cc: catalin.marinas@arm.com Cc: Will Deacon <will.deacon@arm.com> Cc: linux@armlinux.org.uk Cc: stefan.kristiansson@saunalahti.fi Cc: openrisc@lists.librecores.org Cc: shorne@gmail.com Cc: linux-riscv@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Link: https://lkml.kernel.org/r/20180307235731.22627-2-palmer@sifive.com
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@ -1165,4 +1165,22 @@ int __ipi_send_mask(struct irq_desc *desc, const struct cpumask *dest);
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int ipi_send_single(unsigned int virq, unsigned int cpu);
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int ipi_send_mask(unsigned int virq, const struct cpumask *dest);
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#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER
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/*
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* Registers a generic IRQ handling function as the top-level IRQ handler in
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* the system, which is generally the first C code called from an assembly
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* architecture-specific interrupt handler.
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*
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* Returns 0 on success, or -EBUSY if an IRQ handler has already been
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* registered.
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*/
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int __init set_handle_irq(void (*handle_irq)(struct pt_regs *));
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/*
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* Allows interrupt handlers to find the irqchip that's been registered as the
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* top-level IRQ handler.
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*/
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extern void (*handle_arch_irq)(struct pt_regs *) __ro_after_init;
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#endif
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#endif /* _LINUX_IRQ_H */
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@ -132,3 +132,8 @@ config GENERIC_IRQ_DEBUGFS
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If you don't know what to do here, say N.
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endmenu
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config GENERIC_IRQ_MULTI_HANDLER
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bool
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help
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Allow to specify the low level IRQ handler at run time.
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@ -20,6 +20,10 @@
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#include "internals.h"
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#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER
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void (*handle_arch_irq)(struct pt_regs *) __ro_after_init;
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#endif
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/**
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* handle_bad_irq - handle spurious and unhandled irqs
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* @desc: description of the interrupt
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@ -207,3 +211,14 @@ irqreturn_t handle_irq_event(struct irq_desc *desc)
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irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
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return ret;
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}
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#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER
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int __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
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{
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if (handle_arch_irq)
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return -EBUSY;
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handle_arch_irq = handle_irq;
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return 0;
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}
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#endif
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