Hi, This patch series provides a way for irqchips to define some IRQs as NMIs.
For this to be possible, the irqchip must: - be a root irqchip - not require bus locking - have the NMI support flag Once these conditions are met, interrupt lines can be requested as NMIs. These lines must not be shared and the IRQ handling must not be threaded. Callbacks are added to the irqchip in order to set up (clean up) the necessary resources for NMIs before enabling (before releasing) the corresponding interrupt line. I'll soon post a series making use of the API for Arm's GICv3. Patches 1 & 2 provide functions necessary to request and manage NMIs. Patches 3 & 4 provide functions for NMI handling. Changes since v1[1]: - Rebased to v4.19-rc1 - Fix some coding style issues Changes since RFC[2]: - Rebased to v4.18-rc6 - Remove disable_nmi, one should call disable_nmi_nosync instead - Remove code related to affinity balancing from NMI functions - Require PERCPU configuration for NMIs [1] https://lkml.org/lkml/2018/7/24/321 [2] https://lkml.org/lkml/2018/7/9/768 Cheers, Julien --> Julien Thierry (4): genirq: Provide basic NMI management for interrupt lines genirq: Provide NMI management for percpu_devid interrupts genirq: Provide NMI handlers irqdesc: Add domain handler for NMIs include/linux/interrupt.h | 18 +++ include/linux/irq.h | 10 ++ include/linux/irqdesc.h | 3 + kernel/irq/chip.c | 54 +++++++ kernel/irq/debugfs.c | 6 +- kernel/irq/internals.h | 2 + kernel/irq/irqdesc.c | 33 ++++ kernel/irq/manage.c | 377 +++++++++++++++++++++++++++++++++++++++++++++- 8 files changed, 500 insertions(+), 3 deletions(-) -- 1.9.1
