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=-8.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=unavailable 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 57766C433EF for ; Wed, 22 Sep 2021 21:24:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3A79660F44 for ; Wed, 22 Sep 2021 21:24:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238044AbhIVVZp (ORCPT ); Wed, 22 Sep 2021 17:25:45 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:27299 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237802AbhIVVZo (ORCPT ); Wed, 22 Sep 2021 17:25:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1632345853; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5bSXV/WbyIuvflNI0O5gv8cTQJk2LfpQktDl+auRuYw=; b=L37TpUL4UUc5pDnzxM0hNyQd43uOGwTsDunt6IzmJjC1O8gluODtiEv9ThhHbgLvjFm+Cf mY7fyXc1+Jkrfoxr940MbgLSbH5Fm1n3jnLtPE1yVgzFk6pAsEtXrjVR139ZzuyPMLieZE EbS8E8PbVgTzwUGbSgRDREw2WLr8I5o= Received: from mail-oi1-f198.google.com (mail-oi1-f198.google.com [209.85.167.198]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-564-Xf-q7DGOPpeZiVq3m5MEFw-1; Wed, 22 Sep 2021 17:24:12 -0400 X-MC-Unique: Xf-q7DGOPpeZiVq3m5MEFw-1 Received: by mail-oi1-f198.google.com with SMTP id bh31-20020a056808181f00b0026d71fa022cso2577537oib.9 for ; Wed, 22 Sep 2021 14:24:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to :references:organization:mime-version:content-transfer-encoding; bh=5bSXV/WbyIuvflNI0O5gv8cTQJk2LfpQktDl+auRuYw=; b=I93fz0cOP0Z2KGIB7kbNmphowD0ViWeLE06EftqKB4Q9JdUTxegeqUXxEtvfMNf34U LnW/NMv8if100i1mjTq+Ve5kVPqmEaq142lHqCwJR44SeB3atkXZq77j34d4fi1Sdfvv DyZuGVfUcB/qEB2kGEzhegydzETxUFpmJw8/BlPWqcuns66PfkfdxIDNay2wdYMFy3c7 W+FhhW8A/lhw/cQe68EYcob2zemi1y5AlSy2w8HrnwyT5oFhgb3/AF/34GDZEOe8A4De 2f87YPuYtpgi6SSKyWuwHzabQsLBKPlEKJiIx6BxMBmZSs8dGT1IoRXJitvtuhdIZDrE U0sg== X-Gm-Message-State: AOAM533nr2Ha/nu1qqEpHHRughbEgZKCfdSvyhAszE9CxSTmdlE+RXnA vWBBTesQXhrMkcA2O4wXJZ/OGnzuAR2uXb6ZX0M9JfVaRD+6078pwPfBoiHyv4Vy8MLdvY7l+U2 eS4OfWTu/jgOB9gJ6JuKuXJRy X-Received: by 2002:a05:6808:2026:: with SMTP id q38mr1062567oiw.15.1632345849576; Wed, 22 Sep 2021 14:24:09 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxdoCWR7q3blhAcNoLIpqhCzivqr2u9tYk00GR6mvZvaI93uSxrNhlQY0cnvU77gFLtK4G4DA== X-Received: by 2002:a05:6808:2026:: with SMTP id q38mr1062549oiw.15.1632345849392; Wed, 22 Sep 2021 14:24:09 -0700 (PDT) Received: from redhat.com ([198.99.80.109]) by smtp.gmail.com with ESMTPSA id s24sm788936otp.36.2021.09.22.14.24.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Sep 2021 14:24:09 -0700 (PDT) Date: Wed, 22 Sep 2021 15:24:07 -0600 From: Alex Williamson To: Liu Yi L Cc: jgg@nvidia.com, hch@lst.de, jasowang@redhat.com, joro@8bytes.org, jean-philippe@linaro.org, kevin.tian@intel.com, parav@mellanox.com, lkml@metux.net, pbonzini@redhat.com, lushenming@huawei.com, eric.auger@redhat.com, corbet@lwn.net, ashok.raj@intel.com, yi.l.liu@linux.intel.com, jun.j.tian@intel.com, hao.wu@intel.com, dave.jiang@intel.com, jacob.jun.pan@linux.intel.com, kwankhede@nvidia.com, robin.murphy@arm.com, kvm@vger.kernel.org, iommu@lists.linux-foundation.org, dwmw2@infradead.org, linux-kernel@vger.kernel.org, baolu.lu@linux.intel.com, david@gibson.dropbear.id.au, nicolinc@nvidia.com Subject: Re: [RFC 10/20] iommu/iommufd: Add IOMMU_DEVICE_GET_INFO Message-ID: <20210922152407.1bfa6ff7.alex.williamson@redhat.com> In-Reply-To: <20210919063848.1476776-11-yi.l.liu@intel.com> References: <20210919063848.1476776-1-yi.l.liu@intel.com> <20210919063848.1476776-11-yi.l.liu@intel.com> Organization: Red Hat X-Mailer: Claws Mail 3.18.0 (GTK+ 2.24.33; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 19 Sep 2021 14:38:38 +0800 Liu Yi L wrote: > +struct iommu_device_info { > + __u32 argsz; > + __u32 flags; > +#define IOMMU_DEVICE_INFO_ENFORCE_SNOOP (1 << 0) /* IOMMU enforced snoop */ Is this too PCI specific, or perhaps too much of the mechanism rather than the result? ie. should we just indicate if the IOMMU guarantees coherent DMA? Thanks, Alex > +#define IOMMU_DEVICE_INFO_PGSIZES (1 << 1) /* supported page sizes */ > +#define IOMMU_DEVICE_INFO_ADDR_WIDTH (1 << 2) /* addr_wdith field valid */ > + __u64 dev_cookie; > + __u64 pgsize_bitmap; > + __u32 addr_width; > +}; > + > +#define IOMMU_DEVICE_GET_INFO _IO(IOMMU_TYPE, IOMMU_BASE + 1) > > #define IOMMU_FAULT_PERM_READ (1 << 0) /* read */ > #define IOMMU_FAULT_PERM_WRITE (1 << 1) /* write */