Messages in this thread | | | From | Julien Thierry <> | Subject | [PATCH 0/4] Provide core API for NMIs | Date | Tue, 24 Jul 2018 12:07:03 +0100 |
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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.
For reference, see the examples of the support provided by GICv3 [1] and for the request and management of an NMI in the arm_pmu driver [2]. (These are not on the list yet as I'd like the focus of the discussion to be on the API for now)
This work was motivated by a discussion on Ricardo Neri's patch [3]
Patches 1 & 2 provide functions necessary to request and manage NMIs. Patches 3 & 4 provide functions for NMI handling.
Changes since RFC[4]: - 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] http://www.linux-arm.org/git?p=linux-jt.git;a=commitdiff;h=be1beaf15fe840c8a430b9a8191a5b33877f3c0f [2] http://www.linux-arm.org/git?p=linux-jt.git;a=commitdiff;h=cc35056203445a38b1343fc23d6f3a7b2d707603 [3] https://patchwork.kernel.org/patch/10461381/ [4] https://lkml.org/lkml/2018/7/9/768
Thanks,
Julien
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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 | 1 + kernel/irq/irqdesc.c | 33 ++++ kernel/irq/manage.c | 377 +++++++++++++++++++++++++++++++++++++++++++++- 8 files changed, 499 insertions(+), 3 deletions(-)
-- 1.9.1
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