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Mon, 23 Sep 2024 15:35:27 -0700 From: William Tu To: Subject: [SRU][J:linux-bluefield][PATCH v6 1/6] UBUNTU: SAUCE: dma-buf: Add dma_buf_try_get() Date: Mon, 23 Sep 2024 22:35:17 +0000 Message-ID: <20240923223522.1203691-2-witu@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240923223522.1203691-1-witu@nvidia.com> References: <20240923223522.1203691-1-witu@nvidia.com> MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0001AB78:EE_|SA1PR12MB8741:EE_ X-MS-Office365-Filtering-Correlation-Id: c9d6eb2b-6eeb-4487-e67e-08dcdc200f9c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|36860700013|82310400026|376014|1800799024; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc7edge1.nvidia.com; CAT:NONE; SFS:(13230040)(36860700013)(82310400026)(376014)(1800799024); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Sep 2024 22:35:43.6897 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c9d6eb2b-6eeb-4487-e67e-08dcdc200f9c X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.118.232]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB78.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB8741 Received-SPF: softfail client-ip=40.107.236.74; envelope-from=witu@nvidia.com; helo=NAM11-BN8-obe.outbound.protection.outlook.com X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.20 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: vlad@nvidia.com, bodong@nvidia.com, sergeygo@nvidia.com, jgg@nvidia.com, zwaksman@nvidia.com Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: "kernel-team" From: Jason Gunthorpe BugLink: https://bugs.launchpad.net/bugs/2077887 Used to increment the refcount of the dma buf's struct file, only if the refcount is not zero. 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 Signed-off-by: William Tu --- 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 3ad636a13b8e..68a4326833d6 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -609,6 +609,19 @@ 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 *,