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Wed, 06 Jun 2018 21:28:13 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id w56LSCRe006885 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 6 Jun 2018 21:28:12 GMT Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id w56LSB3p025417; Wed, 6 Jun 2018 21:28:11 GMT Received: from dhcp-burlington7-2nd-B-east-10-152-55-162.usdhcp.oraclecorp.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 06 Jun 2018 21:28:11 +0000 Subject: Re: [PATCH v2 6/9] xen/gntdev: Add initial support for dma-buf UAPI To: Oleksandr Andrushchenko , xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, jgross@suse.com, konrad.wilk@oracle.com Cc: daniel.vetter@intel.com, dongwon.kim@intel.com, matthew.d.roper@intel.com, Oleksandr Andrushchenko References: <20180601114132.22596-1-andr2000@gmail.com> <20180601114132.22596-7-andr2000@gmail.com> <29c1f1fb-2d52-e3df-adce-44fdee135413@oracle.com> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8916 signatures=668702 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1805220000 definitions=main-1806060236 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/06/2018 05:06 AM, Oleksandr Andrushchenko wrote: > On 06/04/2018 11:49 PM, Boris Ostrovsky wrote: >> On 06/01/2018 07:41 AM, Oleksandr Andrushchenko wrote: >> +struct gntdev_dmabuf_export_args { >> +    int dummy; >> +}; >> >> Please define the full structure (at least what you have in the next >> patch) here. > Ok, will define what I have in the next patch, but won't > initialize anything until the next patch. Will this work for you? Sure, I just didn't see the need for the dummy argument that you remove later. >> >>> diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c >>> index 9813fc440c70..7d58dfb3e5e8 100644 >>> --- a/drivers/xen/gntdev.c >>> +++ b/drivers/xen/gntdev.c >> ... >> >>>   +#ifdef CONFIG_XEN_GNTDEV_DMABUF >> This code belongs in gntdev-dmabuf.c. > The reason I have this code here is that it is heavily > tied to gntdev's internal functionality, e.g. map/unmap. > I do not want to extend gntdev's API, so gntdev-dmabuf can > access these. What is more dma-buf doesn't need to know about > maps done by gntdev as there is no use of that information > in gntdev-dmabuf. So, it seems more naturally to have > dma-buf's related map/unmap code where it is: in gntdev. Sorry, I don't follow. Why would this require extending the API? It's just moving routines to a different file that is linked to the same module. Since this is under CONFIG_XEN_GNTDEV_DMABUF then why shouldn't it be in gntdev-dmabuf.c? In my view that's the file where all dma-related "stuff" lives. -boris -boris