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Tue, 15 Sep 2026 07:10:39 -0700 From: Yishai Hadas To: , CC: , , , , , , , , , , , , , , , Subject: [PATCH V1 rdma-next 07/15] RDMA/umem: Derive DMA direction from IB access flags Date: Tue, 15 Sep 2026 17:09:25 +0300 Message-ID: <20260915140933.40580-8-yishaih@nvidia.com> X-Mailer: git-send-email 2.18.1 In-Reply-To: <20260915140933.40580-1-yishaih@nvidia.com> References: <20260915140933.40580-1-yishaih@nvidia.com> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF00021F6E:EE_|SN7PR12MB7787:EE_ X-MS-Office365-Filtering-Correlation-Id: 38e6e936-91a5-43e4-ab60-08df1333336e X-LD-Processed: 43083d15-7273-40c1-b7db-39efd9ccc17a,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|36860700016|23010399003|1800799024|82310400026|3023799007|10067099003|56012099006|11063799006|18002099003|22082099003; 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Where the IOMMU enforces direction this prevents the device writing to read-only buffers; where it does not the mapping is still semantically correct. Signed-off-by: Yishai Hadas --- drivers/infiniband/core/umem.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c index f1da70c4e352..b1ab4f0359b0 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -159,6 +159,11 @@ unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem, } EXPORT_SYMBOL(ib_umem_find_best_pgsz); +static inline enum dma_data_direction ib_access_dma_dir(int access) +{ + return ib_access_writable(access) ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE; +} + static struct ib_umem *__ib_umem_get_va(struct ib_device *device, unsigned long addr, size_t size, int access, @@ -329,7 +334,8 @@ struct ib_umem *ib_umem_get_desc(struct ib_device *device, const struct ib_uverbs_buffer_desc *desc, int access) { - return __ib_umem_get_desc_dir(device, desc, access, DMA_BIDIRECTIONAL); + return __ib_umem_get_desc_dir(device, desc, access, + ib_access_dma_dir(access)); } EXPORT_SYMBOL(ib_umem_get_desc); @@ -482,7 +488,7 @@ struct ib_umem *ib_umem_get_attr(struct ib_device *device, u16 attr_id, size_t size, int access) { return ib_umem_get_from_attrs(device, attrs, attr_id, NULL, size, - access, DMA_BIDIRECTIONAL); + access, ib_access_dma_dir(access)); } EXPORT_SYMBOL(ib_umem_get_attr); @@ -521,7 +527,8 @@ struct ib_umem *ib_umem_get_attr_or_va(struct ib_device *device, int access) { return ib_umem_get_from_attrs_or_va(device, attrs, attr_id, NULL, addr, - size, access, DMA_BIDIRECTIONAL); + size, access, + ib_access_dma_dir(access)); } EXPORT_SYMBOL(ib_umem_get_attr_or_va); -- 2.18.1