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=-9.8 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,URIBL_BLOCKED,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 78988C3B18C for ; Thu, 13 Feb 2020 16:52:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 503B924650 for ; Thu, 13 Feb 2020 16:52:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="FATGPw/0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727972AbgBMQwG (ORCPT ); Thu, 13 Feb 2020 11:52:06 -0500 Received: from mail-wm1-f65.google.com ([209.85.128.65]:37316 "EHLO mail-wm1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728009AbgBMQwG (ORCPT ); Thu, 13 Feb 2020 11:52:06 -0500 Received: by mail-wm1-f65.google.com with SMTP id a6so7567992wme.2 for ; Thu, 13 Feb 2020 08:52:05 -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=mXCUGqeL6PbA336GlcM8rHQqOkBRfH65mxhuhA/oiUg=; b=FATGPw/03i+6ra7pZ+0f2Yx7d0nkjAHHARTnqpWONoRS28EzIc1UyHX9MFMwcYzjMO tDZF/Te4B8oxJVrV1QVr1LCSEri3Tg2n5xWLUhn1au776Ax4XiUmQ2kdo7lRUa6qX1Sx /Fy56EkZGaDzdzOVIv1VC7bH47seMnoM/b2J6jXZAxmX5hqaaoNdLx2scUViX1CzZjFB e+L7Uz0O+ni5Lcnojs3FGqgeQ9Nl7VMoe0T+RV7D5e7qrYVSitpvavCEIt6HXReEVnj5 /n1chMpOz0k3HzMYg+rmm+sEkqhCAl9Zp8e+q8evyaL6NW/jWEpQKBfb0sQC3GI0RrPY +d8Q== 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=mXCUGqeL6PbA336GlcM8rHQqOkBRfH65mxhuhA/oiUg=; b=IdyRpN57cWq3oc22PBBB7uAdGvysViVEKUlDAPI9/4t1532m/A5nbBv0SjYqgkNm2D 7vwh+GX1MrPUQeY6aT28vK1tbi1mHI63eXN0Dd4TNfy3dy8vF/+1KvVWFDT4Sws6BRBx ERKJjAq0SWxShMkbFSbdg2UXaBo0y4pMY54d7OJkOpLcQHml1OOmwmuYYCTFOpVBDM1n SKJKpCjTQMqcP7ubvqhWLVld6dIYmLh20FOCC2tDb8Q88G6fC6bj30tGMwrbQLkpp/bY xj4IJNfJ9hilxk83pdqFRGitTjY2kW6zkOyIrLnBxH8fnDokFhkrezkX50McONZ3qoOU Rfbw== X-Gm-Message-State: APjAAAXlYXtSqWkgF29S1FgmU4SC7KYYDTRs2jXWZ+mTJ3rM/FXRSHcP 8UAMdGUAr18MXliLvHhRm9d0bw== X-Google-Smtp-Source: APXvYqzT+gxKpbYpQdrXRe7VcscUkXpdsiUrg5UigA1Q8dxYZpS/a2crEVA74fADKvuMRYM9+kU+PQ== X-Received: by 2002:a7b:c109:: with SMTP id w9mr6554015wmi.14.1581612725090; Thu, 13 Feb 2020 08:52:05 -0800 (PST) Received: from localhost.localdomain ([2001:171b:2276:930:116c:c27a:3e7f:5eaf]) by smtp.gmail.com with ESMTPSA id y6sm3484807wrl.17.2020.02.13.08.52.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Feb 2020 08:52:04 -0800 (PST) From: Jean-Philippe Brucker To: bhelgaas@google.com, will@kernel.org, robh+dt@kernel.org, lorenzo.pieralisi@arm.com, joro@8bytes.org, baolu.lu@linux.intel.com, linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org Cc: corbet@lwn.net, mark.rutland@arm.com, liviu.dudau@arm.com, sudeep.holla@arm.com, guohanjun@huawei.com, rjw@rjwysocki.net, lenb@kernel.org, robin.murphy@arm.com, dwmw2@infradead.org, amurray@thegoodpenguin.co.uk, frowand.list@gmail.com Subject: [PATCH 01/11] dt-bindings: PCI: generic: Add ats-supported property Date: Thu, 13 Feb 2020 17:50:39 +0100 Message-Id: <20200213165049.508908-2-jean-philippe@linaro.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200213165049.508908-1-jean-philippe@linaro.org> References: <20200213165049.508908-1-jean-philippe@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Add a way for firmware to tell the OS that ATS is supported by the PCI root complex. An endpoint with ATS enabled may send Translation Requests and Translated Memory Requests, which look just like Normal Memory Requests with a non-zero AT field. So a root controller that ignores the AT field may simply forward the request to the IOMMU as a Normal Memory Request, which could end badly. In any case, the endpoint will be unusable. The ats-supported property allows the OS to only enable ATS in endpoints if the root controller can handle ATS requests. Only add the property to pcie-host-ecam-generic for the moment. For non-generic root controllers, availability of ATS can be inferred from the compatible string. Signed-off-by: Jean-Philippe Brucker --- Documentation/devicetree/bindings/pci/host-generic-pci.yaml | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.yaml b/Documentation/devicetree/bindings/pci/host-generic-pci.yaml index 47353d0cd394..7d40edd7f1ef 100644 --- a/Documentation/devicetree/bindings/pci/host-generic-pci.yaml +++ b/Documentation/devicetree/bindings/pci/host-generic-pci.yaml @@ -107,6 +107,12 @@ properties: dma-coherent: true + ats-supported: + description: + Indicates that a PCIe host controller supports ATS, and can handle Memory + Requests with Address Type (AT). + type: boolean + required: - compatible - reg -- 2.25.0