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 4AD1BC6FD18 for ; Fri, 31 Mar 2023 10:24:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231337AbjCaKYr (ORCPT ); Fri, 31 Mar 2023 06:24:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58254 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230206AbjCaKY2 (ORCPT ); Fri, 31 Mar 2023 06:24:28 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 75C6720DB6 for ; Fri, 31 Mar 2023 03:22:00 -0700 (PDT) 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 B7C1562769 for ; Fri, 31 Mar 2023 10:21:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1BE3FC433EF; Fri, 31 Mar 2023 10:21:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1680258119; bh=C1WMkoOxoybDfk1/IJGTeuzoGrCkYsIqojJIkyZbsJg=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=ddhmyrh0jYbgQqMIpmLBv8HgCw+VUc69d6G5klZw6WWhXDzUcJ7PNmdiA2ZqRdV+6 f4h4OpOp0qGQO5xdxnFQ/JDtJyWqM7lXG/sahwshIG5IafnQcvcYCzIBUz/sFZL9Dz 47h7RdzhnegCZ/9WVjvqy44wn2Kgw3HevDWTkwnplAVl16kPI6PPldOIKLUvbwpAWL P9wXrOpopiJmYU4YhxaB62jgIUl9G8S8SCjMa/gXVGWABmeI8IZl4mLjcT0wd4PUYt PXGZ6Asg+oVIMD3iX1IA+Eu1VzKYeZz1GCMg6U+a9RzXCAwa+Tbg4YSZQPm95flnje us0NexRnuVmZg== 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 1piBtN-004en5-3e; Fri, 31 Mar 2023 11:21:57 +0100 Date: Fri, 31 Mar 2023 11:21:56 +0100 Message-ID: <868rfdw797.wl-maz@kernel.org> From: Marc Zyngier To: Peng Fan , Lorenzo Pieralisi Cc: "linux-kernel@vger.kernel.org" Subject: Re: gic700 shareability question In-Reply-To: References: 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/28.2 (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: peng.fan@nxp.com, lpieralisi@kernel.org, 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 + Lorenzo On Tue, 28 Mar 2023 13:48:19 +0100, Peng Fan wrote: > > Hi Marc, > > We have an SoC that use GIC-700, but not support shareability, Define this. The IP does support shareability, but your integration doesn't? > Currently I just hack the code as below. Do you think it is feasible > to add firmware bindings such that these can be used to define > the correct shareability/cacheability instead of relying on the > programmability of the CBASER register? > > Saying with "broken-shareability", we just clear all the shareability > settings. This is the same thing as the Rockchip crap, so you are in good company. I've repeatedly stated that this needs to be handled: - either by describing the full system topology and describe what is in the same inner-shareable domain as the CPUs, which needs to encompass both DT and ACPI (starting with DT seems reasonable), - or as a SoC specific erratum, but not as a general "sh*t happened" property. AFAIK, Lorenzo is looking into this. M. -- Without deviation from the norm, progress is not possible.