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=BAYES_00,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 688E4C48BE6 for ; Mon, 14 Jun 2021 09:38:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3B89861357 for ; Mon, 14 Jun 2021 09:38:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232630AbhFNJkW (ORCPT ); Mon, 14 Jun 2021 05:40:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:55708 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232528AbhFNJkW (ORCPT ); Mon, 14 Jun 2021 05:40:22 -0400 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DB29D611CE; Mon, 14 Jun 2021 09:38:19 +0000 (UTC) Received: from [185.219.108.64] (helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1lsj2v-007ORw-Nk; Mon, 14 Jun 2021 10:38:17 +0100 Date: Mon, 14 Jun 2021 10:38:17 +0100 Message-ID: <87a6nsrdkm.wl-maz@kernel.org> From: Marc Zyngier To: Anup Patel Cc: Anup Patel , Palmer Dabbelt , Palmer Dabbelt , Paul Walmsley , Thomas Gleixner , Daniel Lezcano , Rob Herring , Atish Patra , Alistair Francis , linux-riscv , "linux-kernel@vger.kernel.org List" , DTML Subject: Re: [RFC PATCH v1 05/10] irqchip: Add ACLINT software interrupt driver In-Reply-To: References: <20210612160422.330705-1-anup.patel@wdc.com> <20210612160422.330705-6-anup.patel@wdc.com> <878s3et831.wl-maz@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: anup@brainfault.org, anup.patel@wdc.com, palmer@dabbelt.com, palmerdabbelt@google.com, paul.walmsley@sifive.com, tglx@linutronix.de, daniel.lezcano@linaro.org, robh+dt@kernel.org, atish.patra@wdc.com, Alistair.Francis@wdc.com, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Sun, 13 Jun 2021 13:25:40 +0100, Anup Patel wrote: > > On Sun, Jun 13, 2021 at 3:11 PM Marc Zyngier wrote: > > > > I'm sorry, but this really isn't an irqchip driver. This is a piece of > > arch-specific code that uses *none* of the irq subsystem abstractions > > apart from the IRQCHIP_DECLARE() macro. > > Yes, I was not sure we can call it IRQCHIP hence the RFC PATCH. > > Both ACLINT MSWI and SSWI are special devices providing only IPI > support so I will re-think how to fit this. It depends on how you think of IPIs in your architecture. arm64 (and even now 32bit) have been moved to a mode where IPIs are normal interrupts, as it helps with other things such as our pseudo NMIs, and reduces code duplication. MIPS has done the same for a long time (they don't have dedicated HW for that). M. -- Without deviation from the norm, progress is not possible.