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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2FEF2C4332F for ; Fri, 9 Dec 2022 11:13:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229850AbiLILNd (ORCPT ); Fri, 9 Dec 2022 06:13:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41466 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229530AbiLILNa (ORCPT ); Fri, 9 Dec 2022 06:13:30 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 06A2D1E736 for ; Fri, 9 Dec 2022 03:13:29 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8D99462219 for ; Fri, 9 Dec 2022 11:13:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EC19DC433D2; Fri, 9 Dec 2022 11:13:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1670584409; bh=Fzc26OA/VpzVRwEIUTJExr3uhdFIYcmGJP1zt+tLuvo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=qpNo6GIDlyZzVH97iiZzmr1qMWhOTJyjUllEn164OhfPSiji1cGu8YXnoPnTSZBNZ v7IfI+ErqbIps91LqIlCYFy5Ff1/VUXgrCKt4dUiYJ29hjIIniCNrS2ULmovawNfvF BcDdZVr/RVVQdWdVcNpRMQEZ/0pLlQEYt+FPnWTAXB4316PR60mRY9Q7D3dMISh+YO XQfjUfnTEn4yzf3qGs1jhEhcgWkBakF9vhdKFNcX2W5autmgIIQ72XEcTluqEsSH3z 9/yDiGU8UCwf2VcwAEsboDZdmuCj/YEpk6KktjM7T+1rU6J18eztp0GDiD3a5Ca7mQ TLI3HsTkdK30Q== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1p3bJm-00BZXO-Mn; Fri, 09 Dec 2022 11:13:26 +0000 Date: Fri, 09 Dec 2022 11:13:26 +0000 Message-ID: <86fsdorfs9.wl-maz@kernel.org> From: Marc Zyngier To: Harry Song Cc: Sebastian Reichel , tglx@linutronix.de, linux-kernel@vger.kernel.org Subject: Re: [PATCH] irqchip/gic-v3-its: remove the shareability of ITS In-Reply-To: References: <20221207135223.3938-1-jundongsong1@gmail.com> <86a63zkzru.wl-maz@kernel.org> <20221208165820.5maej4we3mfdeprm@mercury.elektranox.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 (aarch64-unknown-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: jundongsong1@gmail.com, sebastian.reichel@collabora.com, tglx@linutronix.de, linux-kernel@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: linux-kernel@vger.kernel.org On Fri, 09 Dec 2022 03:34:21 +0000, Harry Song wrote: > > Thank you for your reply. I know these two links. > My email is to ask about the root cause of this bug. > > I would like to know whether the driver design of ITS requires that > the CPU and ITS must be in a shared domain. Such as using CCI in > chips; This problem has nothing to do with CCI or coherency. It has to do with how the GIC is plugged in the interconnect and what attributes it advertises. M. -- Without deviation from the norm, progress is not possible.