diff options
| author | Leon Romanovsky <leonro@nvidia.com> | 2025-09-09 16:27:29 +0300 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2025-09-12 00:08:07 +0200 |
| commit | eadaa8b255f36ee39ca97d0815c25eeeb1f5d674 (patch) | |
| tree | 479cf0f9d52e0705991efaf05b7d09ede0d9fe79 /rust/kernel | |
| parent | b9a62320d83863c40973d548dcd379cd6390da20 (diff) | |
dma-mapping: introduce new DMA attribute to indicate MMIO memory
This patch introduces the DMA_ATTR_MMIO attribute to mark DMA buffers
that reside in memory-mapped I/O (MMIO) regions, such as device BARs
exposed through the host bridge, which are accessible for peer-to-peer
(P2P) DMA.
This attribute is especially useful for exporting device memory to other
devices for DMA without CPU involvement, and avoids unnecessary or
potentially detrimental CPU cache maintenance calls.
DMA_ATTR_MMIO is supposed to provide dma_map_resource() functionality
without need to call to special function and perform branching when
processing generic containers like bio_vec by the callers.
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/6f058ec395c5348014860dbc2eed348c17975843.1757423202.git.leonro@nvidia.com
Diffstat (limited to 'rust/kernel')
| -rw-r--r-- | rust/kernel/dma.rs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/rust/kernel/dma.rs b/rust/kernel/dma.rs index 2bc8ab51ec28..61d9eed7a786 100644 --- a/rust/kernel/dma.rs +++ b/rust/kernel/dma.rs @@ -242,6 +242,9 @@ pub mod attrs { /// Indicates that the buffer is fully accessible at an elevated privilege level (and /// ideally inaccessible or at least read-only at lesser-privileged levels). pub const DMA_ATTR_PRIVILEGED: Attrs = Attrs(bindings::DMA_ATTR_PRIVILEGED); + + /// Indicates that the buffer is MMIO memory. + pub const DMA_ATTR_MMIO: Attrs = Attrs(bindings::DMA_ATTR_MMIO); } /// An abstraction of the `dma_alloc_coherent` API. |