On Tue, Aug 19, 2025 at 08:36:45PM +0300, Leon Romanovsky wrote:

From: Leon Romanovsky <leonro@nvidia.com>

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 by
the callers.

'branching when processing generic containers like bio_vec by the callers'

Many of the existing dma_map_resource() users already know the thing
is MMIO and don't have branching..

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 Documentation/core-api/dma-attributes.rst | 18 ++++++++++++++++++
 include/linux/dma-mapping.h               | 20 ++++++++++++++++++++
 include/trace/events/dma.h                |  3 ++-
 rust/kernel/dma.rs                        |  3 +++
 4 files changed, 43 insertions(+), 1 deletion(-)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason