From patchwork Thu Aug 31 08:20:37 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xie Yisheng X-Patchwork-Id: 9931591 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 47AB76022E for ; Thu, 31 Aug 2017 08:39:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3C41A285EF for ; Thu, 31 Aug 2017 08:39:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2FAA72864A; Thu, 31 Aug 2017 08:39:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id BE7D6285EF for ; Thu, 31 Aug 2017 08:39:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=HaQyy9+2XNiDFvjHfM/CE4r+MugDpkh91hqMixgkKJ4=; b=YfJP2oph8ICaSi nyeorIXn7HpANfFc2saDeH1YI+s+6fudwBIS48tJZz7yVsVeog7wBehTzD7b+ekQoYvfkemy1/yFF 1gH6XT2cOsOfpg1Lb1QrffOZlSHLKdjOl9qUYDZGU01om1vT5WWpbiBT0XhlflF9Uam962YdMrtI4 I3oFM2lPTlbvh/I5jVIcowESp4V5telaXoNaGtlDEKCmzsbkS9ZIzUM3fZihYvz4peAURivFiuIT1 CuyZb57mdhVN/6Hg7qvIKE7LLHapRXvf9fjD3F+S6rL0sIfdhp0ZwqHw93UIoz0NYzZt35rxHS3ZD wuXCFYZbtl9dR53av0Eg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dnL0P-0007x5-Go; Thu, 31 Aug 2017 08:39:17 +0000 Received: from szxga04-in.huawei.com ([45.249.212.190]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dnKrP-0002E4-2G for linux-arm-kernel@lists.infradead.org; Thu, 31 Aug 2017 08:30:03 +0000 Received: from 172.30.72.59 (EHLO DGGEMS402-HUB.china.huawei.com) ([172.30.72.59]) by dggrg04-dlp.huawei.com (MOS 4.4.6-GA FastPath queued) with ESMTP id DGG21826; Thu, 31 Aug 2017 16:29:12 +0800 (CST) Received: from linux-ibm.site (10.175.102.37) by DGGEMS402-HUB.china.huawei.com (10.3.19.202) with Microsoft SMTP Server id 14.3.301.0; Thu, 31 Aug 2017 16:28:59 +0800 From: Yisheng Xie To: Subject: [RFC PATCH 1/6] dt-bindings: document stall and PASID properties for IOMMU masters Date: Thu, 31 Aug 2017 16:20:37 +0800 Message-ID: <1504167642-14922-2-git-send-email-xieyisheng1@huawei.com> X-Mailer: git-send-email 1.7.12.4 In-Reply-To: <1504167642-14922-1-git-send-email-xieyisheng1@huawei.com> References: <1504167642-14922-1-git-send-email-xieyisheng1@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.102.37] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A010203.59A7C8DB.002E, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 8ba126ef6085750d0f2fbf455daa2042 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170831_012959_455067_E7DB9693 X-CRM114-Status: GOOD ( 10.88 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, lorenzo.pieralisi@arm.com, lv.zheng@intel.com, will.deacon@arm.com, joro@8bytes.org, liubo95@huawei.com, rjw@rjwysocki.net, robert.moore@intel.com, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org, robh+dt@kernel.org, hanjun.guo@linaro.org, xieyisheng@huawei.com, sudeep.holla@arm.com, chenjiankang1@huawei.com, devel@acpica.org, robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org, lenb@kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jean-Philippe Brucker Document the bindings for stall and PASID capable platform devices. Signed-off-by: Jean-Philippe Brucker --- Documentation/devicetree/bindings/iommu/iommu.txt | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/Documentation/devicetree/bindings/iommu/iommu.txt b/Documentation/devicetree/bindings/iommu/iommu.txt index 5a8b462..7355d7f 100644 --- a/Documentation/devicetree/bindings/iommu/iommu.txt +++ b/Documentation/devicetree/bindings/iommu/iommu.txt @@ -86,6 +86,19 @@ 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: +-------------------- +- dma-can-stall: When present, the master can wait for a DMA transaction + to be handled by the IOMMU and can recover from a fault. For example, if + the page accessed by the DMA transaction isn't mapped, some IOMMUs are + able to stall the transaction and let the OS populate the page tables. + The IOMMU then performs the transaction if the fault was successfully + handled, or aborts the transaction otherwise. + +- pasid-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: ======