From patchwork Wed Jan 15 12:52:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Philippe Brucker X-Patchwork-Id: 205682 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=-9.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT 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 C8C0BC3F68F for ; Wed, 15 Jan 2020 12:53:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 94C7524671 for ; Wed, 15 Jan 2020 12:53:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="RQa6zVa9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726553AbgAOMxe (ORCPT ); Wed, 15 Jan 2020 07:53:34 -0500 Received: from mail-wr1-f66.google.com ([209.85.221.66]:42810 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728884AbgAOMxb (ORCPT ); Wed, 15 Jan 2020 07:53:31 -0500 Received: by mail-wr1-f66.google.com with SMTP id q6so15559936wro.9 for ; Wed, 15 Jan 2020 04:53:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=+Rlh4fuYqJBRp2jOU8B0MlV1M4d0Kd3bn04JlNplJUI=; b=RQa6zVa9SRTjAkDpWaeNQ+TzHNaqSmjwUNjLiSStgQQFU8m1OhdHW06usASKfswEOm ekBnCK32y0eGel6xTuDdUakkQQN3qPA3G8RZ2bB2/vEsRD4EoWf2rDFY7CHKqlFY4vh0 QQFCA9QYc73ULV1UlWEobvL9/no+9Vz/XZYY2Tj674ONdjmt9oZZufAB1mBcKnbhBt2q 4ZyVannnpIUGVhmPOs8HxT18d9vQXPh7dxHC9oOgWg1bO+r8Uh6hZp5mpAIPltKup6q6 726G40en2MsW4RUUOKkrDY94g3Urf6AAlYT9SgfBjoDblDCkp9GNBhcmObIfka7aytXi sROw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=+Rlh4fuYqJBRp2jOU8B0MlV1M4d0Kd3bn04JlNplJUI=; b=nJsaQKoZWpP9wrCo8RLy67mZQx4ReyHITv9WiLPS6mitkoPxYiCNR+9DEAYgB2KCbm ceZrCUZcXV+oDjzCwlxq4km4WLxZzzgu7ESZdn/bDpa/HN0luoeIgfNLn1iA6B66ZS5Q C6cZpm95zok/1rw6cr6WQ7S8B5/J76wmrYgN44psDUBI+ySId1eGFfiyg4lc7tWcrqu6 jikbhq1FtHLgMdmmp7IIoGb0Tq46mRVppTepvyq/pbmL+9l6I5LwnCk7KbEGm5TwwWRc Rb3vfWxEozBnjUOaaNOKavQgO+rz42qDZoc3o+qNJfhHVUxX8rLXjxQl2hJo1GW35evQ ZXKw== X-Gm-Message-State: APjAAAWdyTqsL88GLvv1d3LH9BSZSlyPes13+4oG/oM+PT5bXyz02245 MZp8Lv0XCtMbjKADQQ7YimkrCw== X-Google-Smtp-Source: APXvYqzMgS/+4YiEL+CRzGGcAhTGiJstPbrqmMFBjWd9wKtGLhNavA3EcOaksZRO/N8Ru4NFTMuSgQ== X-Received: by 2002:a05:6000:118d:: with SMTP id g13mr32846130wrx.141.1579092809778; Wed, 15 Jan 2020 04:53:29 -0800 (PST) Received: from localhost.localdomain ([2001:171b:2266:ba60:116c:c27a:3e7f:5eaf]) by smtp.gmail.com with ESMTPSA id d12sm25196171wrp.62.2020.01.15.04.53.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Jan 2020 04:53:29 -0800 (PST) From: Jean-Philippe Brucker To: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org, iommu@lists.linux-foundation.org, will@kernel.org Cc: joro@8bytes.org, robh+dt@kernel.org, mark.rutland@arm.com, lorenzo.pieralisi@arm.com, guohanjun@huawei.com, sudeep.holla@arm.com, rjw@rjwysocki.net, lenb@kernel.org, robin.murphy@arm.com, bhelgaas@google.com, eric.auger@redhat.com, jonathan.cameron@huawei.com, zhangfei.gao@linaro.org Subject: [PATCH v5 02/13] dt-bindings: document PASID property for IOMMU masters Date: Wed, 15 Jan 2020 13:52:28 +0100 Message-Id: <20200115125239.136759-3-jean-philippe@linaro.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200115125239.136759-1-jean-philippe@linaro.org> References: <20200115125239.136759-1-jean-philippe@linaro.org> MIME-Version: 1.0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Arm systems, some platform devices behind an SMMU may support the PASID feature, which offers multiple address space. Let the firmware tell us when a device supports PASID. Reviewed-by: Eric Auger Reviewed-by: Jonathan Cameron Reviewed-by: Rob Herring Signed-off-by: Jean-Philippe Brucker --- Documentation/devicetree/bindings/iommu/iommu.txt | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/iommu/iommu.txt b/Documentation/devicetree/bindings/iommu/iommu.txt index 5a8b4624defc..3c36334e4f94 100644 --- a/Documentation/devicetree/bindings/iommu/iommu.txt +++ b/Documentation/devicetree/bindings/iommu/iommu.txt @@ -86,6 +86,12 @@ have a means to turn off translation. But it is invalid in such cases to disable the IOMMU's device tree node in the first place because it would prevent any driver from properly setting up the translations. +Optional properties: +-------------------- +- pasid-num-bits: Some masters support multiple address spaces for DMA, by + tagging DMA transactions with an address space identifier. By default, + this is 0, which means that the device only has one address space. + Notes: ======