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Tue, 03 Sep 2019 22:17:14 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x83ME2pG066676; Tue, 3 Sep 2019 22:15:13 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3020.oracle.com with ESMTP id 2us5phcjm8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 03 Sep 2019 22:15:13 +0000 Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x83MFBg9011620; Tue, 3 Sep 2019 22:15:11 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 03 Sep 2019 15:15:10 -0700 Subject: Re: [PATCH 08/13] swiotlb-xen: always use dma-direct helpers to alloc coherent pages To: Christoph Hellwig , Stefano Stabellini , Konrad Rzeszutek Wilk , gross@suse.com Cc: x86@kernel.org, linux-arm-kernel@lists.infradead.org, xen-devel@lists.xenproject.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org References: <20190902130339.23163-1-hch@lst.de> <20190902130339.23163-9-hch@lst.de> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190902130339.23163-9-hch@lst.de> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9369 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=821 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909030221 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9369 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=875 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909030221 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/2/19 9:03 AM, Christoph Hellwig wrote: > diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c > index b8808677ae1d..f9dd4cb6e4b3 100644 > --- a/drivers/xen/swiotlb-xen.c > +++ b/drivers/xen/swiotlb-xen.c > @@ -299,8 +299,7 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size, > * address. In fact on ARM virt_to_phys only works for kernel direct > * mapped RAM memory. Also see comment below. > */ > - ret = xen_alloc_coherent_pages(hwdev, size, dma_handle, flags, attrs); > - > + ret = dma_direct_alloc(hwdev, size, dma_handle, flags, attrs); If I am reading __dma_direct_alloc_pages() correctly there is a path that will force us to use GFP_DMA32 and as Juergen pointed out in another message that may not be desirable. -boris