linux-kernel - Re: [PATCH v5 1/4] genirq: Provide basic NMI management for interrupt lines

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Message-ID: <86imy8vjfe.wl-marc.zyngier@arm.com>
Date:   Mon, 28 Jan 2019 16:25:09 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Julien Thierry <julien.thierry@....com>
Cc:     <linux-kernel@...r.kernel.org>, <tglx@...utronix.de>,
        <peterz@...radead.org>, <mingo@...nel.org>
Subject: Re: [PATCH v5 1/4] genirq: Provide basic NMI management for interrupt lines

On Mon, 28 Jan 2019 15:38:24 +0000,
Julien Thierry <julien.thierry@....com> wrote:
> 
> 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@....com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Marc Zyngier <marc.zyngier@....com>

Reviewed-by: Marc Zyngier <marc.zyngier@....com>

	M.

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