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Wed, 31 Aug 2022 23:12:46 +0000 Received: from MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::462:7fe:f04f:d0d5]) by MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::462:7fe:f04f:d0d5%7]) with mapi id 15.20.5588.010; Wed, 31 Aug 2022 23:12:46 +0000 From: Jason Gunthorpe To: Alex Williamson , =?utf-8?q?Christian_K?= =?utf-8?q?=C3=B6nig?= , Cornelia Huck , dri-devel@lists.freedesktop.org, kvm@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org, Sumit Semwal Subject: [PATCH v2 1/4] dma-buf: Add dma_buf_try_get() Date: Wed, 31 Aug 2022 20:12:41 -0300 Message-Id: <1-v2-472615b3877e+28f7-vfio_dma_buf_jgg@nvidia.com> In-Reply-To: <0-v2-472615b3877e+28f7-vfio_dma_buf_jgg@nvidia.com> References: X-ClientProxiedBy: BLAPR05CA0003.namprd05.prod.outlook.com (2603:10b6:208:36e::10) To MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: a80009d1-1029-43f3-576c-08da8ba65026 X-MS-TrafficTypeDiagnostic: MW5PR12MB5650:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Useful to allow the struct file's lifetime to control the lifetime of the dmabuf while still letting the driver to keep track of created dmabufs. Signed-off-by: Jason Gunthorpe --- include/linux/dma-buf.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 71731796c8c3a8..a35f1554f2fb36 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -618,6 +618,19 @@ int dma_buf_fd(struct dma_buf *dmabuf, int flags); struct dma_buf *dma_buf_get(int fd); void dma_buf_put(struct dma_buf *dmabuf); +/** + * dma_buf_try_get - try to get a reference on a dmabuf + * @dmabuf - the dmabuf to get + * + * Returns true if a reference was successfully obtained. The caller must + * interlock with the dmabuf's release function in some way, such as RCU, to + * ensure that this is not called on freed memory. + */ +static inline bool dma_buf_try_get(struct dma_buf *dmabuf) +{ + return get_file_rcu(dmabuf->file); +} + struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *, enum dma_data_direction); void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *,