Re: [PATCH v3 0/8] RDMA: Enable operation with DMA debug enabled

[Marek Szyprowski <m.szyprowski@samsung.com>]

On 16.03.2026 20:06, Leon Romanovsky wrote:
> Add a new DMA_ATTR_REQUIRE_COHERENT attribute to the DMA API to mark
> mappings that must run on a DMA‑coherent system. Such buffers cannot
> use the SWIOTLB path, may overlap with CPU caches, and do not depend on
> explicit cache flushing.
>
> Mappings using this attribute are rejected on systems where cache
> side‑effects could lead to data corruption, and therefore do not need
> the cache‑overlap debugging logic. This series also includes fixes for
> DMA_ATTR_CPU_CACHE_CLEAN handling.
> Thanks.
>
> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

Applied to dma-mapping-fixes. Thanks!

> ---
> Changes in v3:
> - Enriched commit messages and documentation
> - Added ROB tags
> - Link to v2: https://protect2.fireeye.com/v1/url?k=9c1ba148-fd90b40f-9c1a2a07-000babff99aa-86ebd022a97425b3&q=1&e=3c8e10cc-4c34-4bf6-aa9d-c339877d6a27&u=https%3A%2F%2Fpatch.msgid.link%2F20260311-dma-debug-overlap-v2-0-e00bc2ca346d%40nvidia.com
>
> Changes in v2:
> - Added DMA_ATTR_REQUIRE_COHERENT attribute
> - Added HMM patch which needs this attribute as well
> - Renamed DMA_ATTR_CPU_CACHE_CLEAN to be DMA_ATTR_DEBUGGING_IGNORE_CACHELINES
> - Link to v1: https://protect2.fireeye.com/v1/url?k=cc0590de-ad8e8599-cc041b91-000babff99aa-07e4da206b7e0d97&q=1&e=3c8e10cc-4c34-4bf6-aa9d-c339877d6a27&u=https%3A%2F%2Fpatch.msgid.link%2F20260307-dma-debug-overlap-v1-0-c034c38872af%40nvidia.com
>
> ---
> Leon Romanovsky (8):
>        dma-debug: Allow multiple invocations of overlapping entries
>        dma-mapping: handle DMA_ATTR_CPU_CACHE_CLEAN in trace output
>        dma-mapping: Clarify valid conditions for CPU cache line overlap
>        dma-mapping: Introduce DMA require coherency attribute
>        dma-direct: prevent SWIOTLB path when DMA_ATTR_REQUIRE_COHERENT is set
>        iommu/dma: add support for DMA_ATTR_REQUIRE_COHERENT attribute
>        RDMA/umem: Tell DMA mapping that UMEM requires coherency
>        mm/hmm: Indicate that HMM requires DMA coherency
>
>   Documentation/core-api/dma-attributes.rst | 38 ++++++++++++++++++++++++-------
>   drivers/infiniband/core/umem.c            |  5 ++--
>   drivers/iommu/dma-iommu.c                 | 21 +++++++++++++----
>   drivers/virtio/virtio_ring.c              | 10 ++++----
>   include/linux/dma-mapping.h               | 15 ++++++++----
>   include/trace/events/dma.h                |  4 +++-
>   kernel/dma/debug.c                        |  9 ++++----
>   kernel/dma/direct.h                       |  7 +++---
>   kernel/dma/mapping.c                      |  6 +++++
>   mm/hmm.c                                  |  4 ++--
>   10 files changed, 86 insertions(+), 33 deletions(-)
> ---
> base-commit: 11439c4635edd669ae435eec308f4ab8a0804808
> change-id: 20260305-dma-debug-overlap-21487c3fa02c
>
> Best regards,
> --
> Leon Romanovsky <leonro@nvidia.com>
>
>
Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland