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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 E3046C33CAA for ; Tue, 21 Jan 2020 14:47:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B9E6921569 for ; Tue, 21 Jan 2020 14:47:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729080AbgAUOrs (ORCPT ); Tue, 21 Jan 2020 09:47:48 -0500 Received: from foss.arm.com ([217.140.110.172]:44246 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726968AbgAUOrr (ORCPT ); Tue, 21 Jan 2020 09:47:47 -0500 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 4EECE30E; Tue, 21 Jan 2020 06:47:47 -0800 (PST) Received: from [10.1.196.37] (e121345-lin.cambridge.arm.com [10.1.196.37]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5EBF93F52E; Tue, 21 Jan 2020 06:47:46 -0800 (PST) Subject: Re: [PATCH v3 2/5] iommu/arm-smmu: Add support for split pagetables To: Jordan Crouse , iommu@lists.linux-foundation.org Cc: will@kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Joerg Roedel References: <1576514271-15687-1-git-send-email-jcrouse@codeaurora.org> <1576514271-15687-3-git-send-email-jcrouse@codeaurora.org> From: Robin Murphy Message-ID: <03d68ca6-254d-227f-e428-b85f6f4d7981@arm.com> Date: Tue, 21 Jan 2020 14:47:44 +0000 User-Agent: Mozilla/5.0 (X11; Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <1576514271-15687-3-git-send-email-jcrouse@codeaurora.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Oh, one more thing... On 16/12/2019 4:37 pm, Jordan Crouse wrote: [...] > @@ -651,6 +659,7 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, > enum io_pgtable_fmt fmt; > struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain); > struct arm_smmu_cfg *cfg = &smmu_domain->cfg; > + u32 quirks = 0; > > mutex_lock(&smmu_domain->init_mutex); > if (smmu_domain->smmu) > @@ -719,6 +728,8 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, > oas = smmu->ipa_size; > if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH64) { > fmt = ARM_64_LPAE_S1; > + if (smmu_domain->split_pagetables) > + quirks |= IO_PGTABLE_QUIRK_ARM_TTBR1; To avoid me forgetting and questioning it again in future, I'd recommend sticking a comment somewhere near here that we don't reduce cfg->ias in this case because we're currently assuming SEP_UPSTREAM. Robin. > } else if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH32_L) { > fmt = ARM_32_LPAE_S1; > ias = min(ias, 32UL);