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Fri, 15 Jun 2018 21:02:39 +0000 Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id w5FL2cd1010312 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 15 Jun 2018 21:02:39 GMT Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id w5FL2cmx022743; Fri, 15 Jun 2018 21:02:38 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 ; Fri, 15 Jun 2018 14:02:37 -0700 Subject: Re: [PATCH v4 8/9] xen/gntdev: Implement dma-buf export functionality 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: <20180615062753.9229-1-andr2000@gmail.com> <20180615062753.9229-9-andr2000@gmail.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: <20180615062753.9229-9-andr2000@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8925 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=777 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1805220000 definitions=main-1806150225 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/15/2018 02:27 AM, Oleksandr Andrushchenko wrote: > From: Oleksandr Andrushchenko > > 1. Create a dma-buf from grant references provided by the foreign > domain. By default dma-buf is backed by system memory pages, but > by providing GNTDEV_DMA_FLAG_XXX flags it can also be created > as a DMA write-combine/coherent buffer, e.g. allocated with > corresponding dma_alloc_xxx API. > Export the resulting buffer as a new dma-buf. > > 2. Implement waiting for the dma-buf to be released: block until the > dma-buf with the file descriptor provided is released. > If within the time-out provided the buffer is not released then > -ETIMEDOUT error is returned. If the buffer with the file descriptor > does not exist or has already been released, then -ENOENT is > returned. For valid file descriptors this must not be treated as > error. > > 3. Make gntdev's common code and structures available to dma-buf. > > Signed-off-by: Oleksandr Andrushchenko Reviewed-by: Boris Ostrovsky