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genirq: Add CONFIG_GENERIC_IRQ_MULTI_HANDLER

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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
This commit is contained in:
Palmer Dabbelt 2018-03-07 15:57:27 -08:00 committed by Thomas Gleixner
parent b0d8bef8ed
commit caacdbf4aa
3 changed files with 38 additions and 0 deletions
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18
include/linux/irq.h
View File

@ -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 */

5
kernel/irq/Kconfig
View File

@ -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.

15
kernel/irq/handle.c
View File

@ -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