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Commit caacdbf4 authored by Palmer Dabbelt's avatar Palmer Dabbelt Committed by Thomas Gleixner
Browse files

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: default avatarPalmer Dabbelt <palmer@sifive.com>
Signed-off-by: default avatarThomas 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
parent b0d8bef8

include/linux/irq.h

+18 −0
Original line number Diff line number Diff line
@@ -1165,4 +1165,22 @@ int __ipi_send_mask(struct irq_desc *desc, const struct cpumask *dest); 
int ipi_send_single(unsigned int virq, unsigned int cpu);

int ipi_send_mask(unsigned int virq, const struct cpumask *dest);



#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER

/*

 * Registers a generic IRQ handling function as the top-level IRQ handler in

 * the system, which is generally the first C code called from an assembly

 * architecture-specific interrupt handler.

 *

 * Returns 0 on success, or -EBUSY if an IRQ handler has already been

 * registered.

 */

int __init set_handle_irq(void (*handle_irq)(struct pt_regs *));



/*

 * Allows interrupt handlers to find the irqchip that's been registered as the

 * top-level IRQ handler.

 */

extern void (*handle_arch_irq)(struct pt_regs *) __ro_after_init;

#endif



#endif /* _LINUX_IRQ_H */

kernel/irq/Kconfig

+5 −0
Original line number Diff line number Diff line
@@ -132,3 +132,8 @@ config GENERIC_IRQ_DEBUGFS 
	  If you don't know what to do here, say N.



endmenu



config GENERIC_IRQ_MULTI_HANDLER

	bool

	help

	  Allow to specify the low level IRQ handler at run time.

kernel/irq/handle.c

+15 −0
Original line number Diff line number Diff line
@@ -20,6 +20,10 @@ 


#include "internals.h"



#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER

void (*handle_arch_irq)(struct pt_regs *) __ro_after_init;

#endif



/**

 * handle_bad_irq - handle spurious and unhandled irqs

 * @desc:      description of the interrupt
@@ -207,3 +211,14 @@ irqreturn_t handle_irq_event(struct irq_desc *desc) 
	irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);

	return ret;

}



#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER

int __init set_handle_irq(void (*handle_irq)(struct pt_regs *))

{

	if (handle_arch_irq)

		return -EBUSY;



	handle_arch_irq = handle_irq;

	return 0;

}

#endif