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: 194458 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=ham 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 2A329C33CB6 for ; Wed, 15 Jan 2020 12:53:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F34E12467A for ; Wed, 15 Jan 2020 12:53:31 +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 S1726552AbgAOMxb (ORCPT ); Wed, 15 Jan 2020 07:53:31 -0500 Received: from mail-wr1-f67.google.com ([209.85.221.67]:43936 "EHLO mail-wr1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728895AbgAOMxb (ORCPT ); Wed, 15 Jan 2020 07:53:31 -0500 Received: by mail-wr1-f67.google.com with SMTP id d16so15623892wre.10 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=j0S+RtH5vR6JGOtIOwULOStnSpqVsK8rOY0Bo2YaZ6PLbZNeUm5zqPiYiuXWkdl3Q6 TFftpf8Tv4Vc1yw6DYz7nvModVUWcp2I8BIuY/RTJXoY7DPUEDIW8FoNd6ST/F7QXEEX uoLQ/IaNo8wZRxxA/KB6wXmwR0g+aZPA6FE95K0mUFornBi8w3ksGfgf7c4jad4Xsutc yyU9oehvSDMD26qSQi6qmk7KDJnqat7PbDW+Yt0EKn7T6tUk2xYs/cIsjW/fmJfitl0v f9gfBMeA1JMyNTUBjj6qDpTFZAb7PNzoHRGLdlk0pURrTZQETrirpWsvvfhRKhwOJx/7 YCXA== X-Gm-Message-State: APjAAAWUTLiycSYwFmD6t2gB/uSYENF4p+Tbe/di2gTcUS+QorA/g0s6 P90CVFx2UP++pHmKtgBhhkmWyQ== 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: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@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: ======