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Thu, 7 Jan 2021 17:58:14 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 35w3qu1hjs-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 07 Jan 2021 17:58:14 +0000 Received: from abhmp0013.oracle.com (abhmp0013.oracle.com [141.146.116.19]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 107Hvwcu012048; Thu, 7 Jan 2021 17:57:58 GMT Received: from char.us.oracle.com (/10.152.32.25) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 07 Jan 2021 17:57:43 +0000 Received: by char.us.oracle.com (Postfix, from userid 1000) id DE3C86A00C3; Thu, 7 Jan 2021 12:57:40 -0500 (EST) Date: Thu, 7 Jan 2021 12:57:40 -0500 From: Konrad Rzeszutek Wilk To: Claire Chang Subject: Re: [RFC PATCH v3 2/6] swiotlb: Add restricted DMA pool Message-ID: <20210107175740.GA16519@char.us.oracle.com> References: <20210106034124.30560-1-tientzu@chromium.org> <20210106034124.30560-3-tientzu@chromium.org> <20210106185241.GA109735@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.1 (2017-09-22) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9857 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 malwarescore=0 mlxscore=0 spamscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101070105 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9857 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 bulkscore=0 clxscore=1015 spamscore=0 impostorscore=0 priorityscore=1501 mlxscore=0 adultscore=0 mlxlogscore=999 lowpriorityscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101070105 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: heikki.krogerus@linux.intel.com, peterz@infradead.org, grant.likely@arm.com, paulus@samba.org, Frank Rowand , mingo@kernel.org, Marek Szyprowski , sstabellini@kernel.org, Saravana Kannan , "list@263.net:IOMMU DRIVERS , Joerg Roedel , " , rafael.j.wysocki@intel.com, Christoph Hellwig , Bartosz Golaszewski , xen-devel@lists.xenproject.org, Thierry Reding , linux-devicetree , will@kernel.org, dan.j.williams@intel.com, linuxppc-dev@lists.ozlabs.org, Rob Herring , boris.ostrovsky@oracle.com, Andy Shevchenko , jgross@suse.com, Nicolas Boichat , Greg KH , rdunlap@infradead.org, lkml , Tomasz Figa , "list@263.net:IOMMU DRIVERS , Joerg Roedel , " , xypron.glpk@gmx.de, Robin Murphy , bauerman@linux.ibm.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, Jan 08, 2021 at 01:39:18AM +0800, Claire Chang wrote: > Hi Greg and Konrad, > > This change is intended to be non-arch specific. Any arch that lacks DMA access > control and has devices not behind an IOMMU can make use of it. Could you share > why you think this should be arch specific? The idea behind non-arch specific code is it to be generic. The devicetree is specific to PowerPC, Sparc, and ARM, and not to x86 - hence it should be in arch specific code. > > Thanks!