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=-15.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 DF368C4320A for ; Fri, 30 Jul 2021 06:11:06 +0000 (UTC) Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A1ACC60E09 for ; Fri, 30 Jul 2021 06:11:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A1ACC60E09 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id 798ED400FD; Fri, 30 Jul 2021 06:11:06 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8pxH-7R2Ik-z; Fri, 30 Jul 2021 06:11:05 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp2.osuosl.org (Postfix) with ESMTPS id 10001400F8; Fri, 30 Jul 2021 06:11:05 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id E0ABBC001A; Fri, 30 Jul 2021 06:11:04 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [IPv6:2605:bc80:3010::136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 52EA8C000E for ; Fri, 30 Jul 2021 06:11:03 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 35C4F606EB for ; Fri, 30 Jul 2021 06:11:03 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3dPj4xcHPE7L for ; Fri, 30 Jul 2021 06:11:02 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by smtp3.osuosl.org (Postfix) with ESMTPS id 05F9160685 for ; Fri, 30 Jul 2021 06:11:01 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10060"; a="211157109" X-IronPort-AV: E=Sophos;i="5.84,281,1620716400"; d="scan'208";a="211157109" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Jul 2021 23:11:01 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,281,1620716400"; d="scan'208";a="465344955" Received: from allen-box.sh.intel.com (HELO [10.239.159.118]) ([10.239.159.118]) by orsmga008.jf.intel.com with ESMTP; 29 Jul 2021 23:10:58 -0700 Subject: Re: [PATCH v2 14/24] iommu: Introduce explicit type for non-strict DMA domains To: Robin Murphy , joro@8bytes.org, will@kernel.org References: <59a4d350c32a83e21de5dcfe6f041f38b0c35b82.1627468309.git.robin.murphy@arm.com> From: Lu Baolu Message-ID: <3e9035ab-5344-acc7-9c74-32c9137aad86@linux.intel.com> Date: Fri, 30 Jul 2021 14:08:40 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <59a4d350c32a83e21de5dcfe6f041f38b0c35b82.1627468309.git.robin.murphy@arm.com> Content-Language: en-US Cc: linux-kernel@vger.kernel.org, dianders@chromium.org, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 7/28/21 11:58 PM, Robin Murphy wrote: > Promote the difference between strict and non-strict DMA domains from an > internal detail to a distinct domain feature and type, to pave the road > for exposing it through the sysfs default domain interface. > > Signed-off-by: Robin Murphy > --- > drivers/iommu/dma-iommu.c | 2 +- > drivers/iommu/iommu.c | 8 ++++++-- > include/linux/iommu.h | 11 +++++++++++ > 3 files changed, 18 insertions(+), 3 deletions(-) > > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c > index e28396cea6eb..8b3545c01077 100644 > --- a/drivers/iommu/dma-iommu.c > +++ b/drivers/iommu/dma-iommu.c > @@ -1311,7 +1311,7 @@ void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit) > * The IOMMU core code allocates the default DMA domain, which the > * underlying IOMMU driver needs to support via the dma-iommu layer. > */ > - if (domain->type == IOMMU_DOMAIN_DMA) { > + if (iommu_is_dma_domain(domain)) { > if (iommu_dma_init_domain(domain, dma_base, dma_limit, dev)) > goto out_err; > dev->dma_ops = &iommu_dma_ops; > diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c > index fa8109369f74..982545234cf3 100644 > --- a/drivers/iommu/iommu.c > +++ b/drivers/iommu/iommu.c > @@ -115,6 +115,7 @@ static const char *iommu_domain_type_str(unsigned int t) > case IOMMU_DOMAIN_UNMANAGED: > return "Unmanaged"; > case IOMMU_DOMAIN_DMA: > + case IOMMU_DOMAIN_DMA_FQ: > return "Translated"; > default: > return "Unknown"; > @@ -552,6 +553,9 @@ static ssize_t iommu_group_show_type(struct iommu_group *group, > case IOMMU_DOMAIN_DMA: > type = "DMA\n"; > break; > + case IOMMU_DOMAIN_DMA_FQ: > + type = "DMA-FQ\n"; > + break; > } > } > mutex_unlock(&group->mutex); > @@ -765,7 +769,7 @@ static int iommu_create_device_direct_mappings(struct iommu_group *group, > unsigned long pg_size; > int ret = 0; > > - if (!domain || domain->type != IOMMU_DOMAIN_DMA) > + if (!domain || !iommu_is_dma_domain(domain)) > return 0; > > BUG_ON(!domain->pgsize_bitmap); > @@ -1947,7 +1951,7 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, > /* Assume all sizes by default; the driver may override this later */ > domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; > > - if (type == IOMMU_DOMAIN_DMA && iommu_get_dma_cookie(domain)) { > + if (iommu_is_dma_domain(domain) && iommu_get_dma_cookie(domain)) { > iommu_domain_free(domain); > domain = NULL; > } > diff --git a/include/linux/iommu.h b/include/linux/iommu.h > index 141779d76035..046ba4d54cd2 100644 > --- a/include/linux/iommu.h > +++ b/include/linux/iommu.h > @@ -61,6 +61,7 @@ struct iommu_domain_geometry { > #define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API > implementation */ > #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */ > +#define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses flush queue */ > > /* > * This are the possible domain-types > @@ -73,12 +74,17 @@ struct iommu_domain_geometry { > * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations. > * This flag allows IOMMU drivers to implement > * certain optimizations for these domains > + * IOMMU_DOMAIN_DMA_FQ - As above, but definitely using batched TLB > + * invalidation. > */ > #define IOMMU_DOMAIN_BLOCKED (0U) > #define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT) > #define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING) > #define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \ > __IOMMU_DOMAIN_DMA_API) > +#define IOMMU_DOMAIN_DMA_FQ (__IOMMU_DOMAIN_PAGING | \ > + __IOMMU_DOMAIN_DMA_API | \ > + __IOMMU_DOMAIN_DMA_FQ) > > struct iommu_domain { > unsigned type; > @@ -90,6 +96,11 @@ struct iommu_domain { > struct iommu_dma_cookie *iova_cookie; > }; > > +static inline bool iommu_is_dma_domain(struct iommu_domain *domain) > +{ > + return domain->type & __IOMMU_DOMAIN_DMA_API; > +} > + > enum iommu_cap { > IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA > transactions */ > Reviewed-by: Lu Baolu Best regards, baolu _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu