From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4E2E0C282C8 for ; Mon, 28 Jan 2019 16:36:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2A2B420811 for ; Mon, 28 Jan 2019 16:36:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390149AbfA1Qgw (ORCPT ); Mon, 28 Jan 2019 11:36:52 -0500 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:48684 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389882AbfA1QZN (ORCPT ); Mon, 28 Jan 2019 11:25:13 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 92D8680D; Mon, 28 Jan 2019 08:25:13 -0800 (PST) Received: from big-swifty.misterjones.org (big-swifty.cambridge.arm.com [10.1.25.206]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1CFE23F59C; Mon, 28 Jan 2019 08:25:11 -0800 (PST) Date: Mon, 28 Jan 2019 16:25:09 +0000 Message-ID: <86imy8vjfe.wl-marc.zyngier@arm.com> From: Marc Zyngier To: Julien Thierry Cc: , , , Subject: Re: [PATCH v5 1/4] genirq: Provide basic NMI management for interrupt lines In-Reply-To: <1548689907-17124-2-git-send-email-julien.thierry@arm.com> References: <1548689907-17124-1-git-send-email-julien.thierry@arm.com> <1548689907-17124-2-git-send-email-julien.thierry@arm.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 EasyPG/1.0.0 Emacs/25.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Organization: ARM Ltd MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 28 Jan 2019 15:38:24 +0000, Julien Thierry 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 > Cc: Thomas Gleixner > Cc: Peter Zijlstra > Cc: Ingo Molnar > Cc: Marc Zyngier Reviewed-by: Marc Zyngier M. -- Jazz is not dead, it just smell funny.