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| author |   Julien Thierry <julien.thierry@arm.com> | 2019-01-31 14:53:58 +0000 |
|---|---|---|
| committer |   Marc Zyngier <marc.zyngier@arm.com> | 2019-02-05 14:36:57 +0000 |
| commit | b525903c254dab2491410f0f23707691b7c2c317 (patch) | |
| tree | 11bad762c8aae79bfa042e47d263362f8d288b20 /include/linux/interrupt.h | |
| parent | Linux 5.0-rc3 (diff) | |
| download | wireguard-linux-b525903c254dab2491410f0f23707691b7c2c317.tar.xz wireguard-linux-b525903c254dab2491410f0f23707691b7c2c317.zip | |
genirq: Provide basic NMI management for interrupt lines
Add functionality to allocate interrupt lines that will deliver IRQs
as Non-Maskable Interrupts. These allocations are only successful if
the irqchip provides the necessary support and allows NMI delivery for the
interrupt line.
Interrupt lines allocated for NMI delivery must be enabled/disabled through
enable_nmi/disable_nmi_nosync to keep their state consistent.
To treat a PERCPU IRQ as NMI, the interrupt must not be shared nor threaded,
the irqchip directly managing the IRQ must be the root irqchip and the
irqchip cannot be behind a slow bus.
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'include/linux/interrupt.h')
| -rw-r--r-- | include/linux/interrupt.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index c672f34235e7..9941d1a8d83c 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -156,6 +156,10 @@ __request_percpu_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, const char *devname, void __percpu *percpu_dev_id); +extern int __must_check +request_nmi(unsigned int irq, irq_handler_t handler, unsigned long flags, + const char *name, void *dev); + static inline int __must_check request_percpu_irq(unsigned int irq, irq_handler_t handler, const char *devname, void __percpu *percpu_dev_id) @@ -167,6 +171,8 @@ request_percpu_irq(unsigned int irq, irq_handler_t handler, extern const void *free_irq(unsigned int, void *); extern void free_percpu_irq(unsigned int, void __percpu *); +extern const void *free_nmi(unsigned int irq, void *dev_id); + struct device; extern int __must_check @@ -217,6 +223,9 @@ extern void enable_percpu_irq(unsigned int irq, unsigned int type); extern bool irq_percpu_is_enabled(unsigned int irq); extern void irq_wake_thread(unsigned int irq, void *dev_id); +extern void disable_nmi_nosync(unsigned int irq); +extern void enable_nmi(unsigned int irq); + /* The following three functions are for the core kernel use only. */ extern void suspend_device_irqs(void); extern void resume_device_irqs(void); |