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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 8184BC4727C for ; Mon, 21 Sep 2020 22:03:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4E0D123A63 for ; Mon, 21 Sep 2020 22:03:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726574AbgIUWDv (ORCPT ); Mon, 21 Sep 2020 18:03:51 -0400 Received: from foss.arm.com ([217.140.110.172]:59192 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726497AbgIUWDv (ORCPT ); Mon, 21 Sep 2020 18:03:51 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 0A75E147A; Mon, 21 Sep 2020 15:03:51 -0700 (PDT) Received: from [10.57.50.108] (unknown [10.57.50.108]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 300193F73B; Mon, 21 Sep 2020 15:03:49 -0700 (PDT) Subject: Re: [PATCHv4 1/6] iommu/io-pgtable-arm: Add support to use system cache To: Will Deacon , Sai Prakash Ranjan Cc: freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Akhil P Oommen , dri-devel@lists.freedesktop.org, "Kristian H . Kristensen" , linux-arm-kernel@lists.infradead.org References: <3b1beb6cf6a34a44b0ecff9ec5a2105b5ff91bd4.1599832685.git.saiprakash.ranjan@codeaurora.org> <20200921180318.GG3141@willie-the-truck> From: Robin Murphy Message-ID: <9646dd4f-f1e6-992d-b8a0-0f2c14fa9fe8@arm.com> Date: Mon, 21 Sep 2020 23:03:49 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Thunderbird/78.2.2 MIME-Version: 1.0 In-Reply-To: <20200921180318.GG3141@willie-the-truck> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On 2020-09-21 19:03, Will Deacon wrote: > On Fri, Sep 11, 2020 at 07:57:18PM +0530, Sai Prakash Ranjan wrote: >> Add a quirk IO_PGTABLE_QUIRK_SYS_CACHE to override the >> attributes set in TCR for the page table walker when >> using system cache. > > I wonder if the panfrost folks can reuse this for the issue discussed > over at: > > https://lore.kernel.org/r/cover.1600213517.git.robin.murphy@arm.com Isn't this all hinged around the outer cacheability attribute, rather than shareability (since these are nominally NC mappings and thus already properly Osh)? The Panfrost issue is just about shareability domains being a bit wonky; the cacheability attributes there are actually reasonably normal (other than not having a non-cacheable type at all, only a choice of allocation policies...) Robin. > However, Sai, your email setup went wrong when you posted this so you > probably need to repost now that you have that fixed. > > Will > _______________________________________________ > iommu mailing list > iommu@lists.linux-foundation.org > https://lists.linuxfoundation.org/mailman/listinfo/iommu >