linux-kernel - [GIT PULL] dma-mapping updates for Linux 6.18

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Message-Id: <20250930100818.350934-1-m.szyprowski@samsung.com>
Date: Tue, 30 Sep 2025 12:08:18 +0200
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, iommu@...ts.linux.dev, Marek Szyprowski
	<m.szyprowski@...sung.com>, Christoph Hellwig <hch@....de>, Robin Murphy
	<robin.murphy@....com>, Leon Romanovsky <leon@...nel.org>, Jason Gunthorpe
	<jgg@...dia.com>, Qianfeng Rong <rongqianfeng@...o.com>, Petr Tesarik
	<ptesarik@...e.com>
Subject: [GIT PULL] dma-mapping updates for Linux 6.18

The following changes since commit 7e2368a21741e2db542330b32aa6fdd8908e7cff:

  dma-debug: don't enforce dma mapping check on noncoherent allocations (2025-09-02 10:18:16 +0200)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux.git tags/dma-mapping-6.18-2025-09-30

for you to fetch changes up to ef3d979b3e270b6a41b6f306bfc442253c41a4cd:

  kmsan: fix missed kmsan_handle_dma() signature conversion (2025-09-17 14:42:36 +0200)

----------------------------------------------------------------
dma-mapping updates for Linux 6.18:

- refactoring of DMA mapping API to physical addresses as the primary
interface instead of page+offset parameters; this gets much closer to
Matthew Wilcox's long term wish for struct-pageless IO to cacheable DRAM and is
supporting memdesc project which seeks to substantially transform how
struct page works; an advantage of this approach is the possibility of
introducing DMA_ATTR_MMIO, which covers existing 'dma_map_resource' flow
in the common paths, what in turn lets to use recently introduced
dma_iova_link() API to map PCI P2P MMIO without creating struct page;
developped by Leon Romanovsky and Jason Gunthorpe
- minor clean-up by Petr Tesarik and Qianfeng Rong

----------------------------------------------------------------
Leon Romanovsky (14):
      dma-mapping: introduce new DMA attribute to indicate MMIO memory
      iommu/dma: implement DMA_ATTR_MMIO for dma_iova_link().
      dma-debug: refactor to use physical addresses for page mapping
      dma-mapping: rename trace_dma_*map_page to trace_dma_*map_phys
      iommu/dma: rename iommu_dma_*map_page to iommu_dma_*map_phys
      iommu/dma: implement DMA_ATTR_MMIO for iommu_dma_(un)map_phys()
      dma-mapping: convert dma_direct_*map_page to be phys_addr_t based
      kmsan: convert kmsan_handle_dma to use physical addresses
      dma-mapping: implement DMA_ATTR_MMIO for dma_(un)map_page_attrs()
      xen: swiotlb: Open code map_resource callback
      dma-mapping: export new dma_*map_phys() interface
      mm/hmm: migrate to physical address-based DMA mapping API
      mm/hmm: properly take MMIO path
      kmsan: fix missed kmsan_handle_dma() signature conversion

Marek Szyprowski (1):
      Merge tag 'dma-mapping-6.17-2025-09-09' into HEAD

Petr Tesarik (1):
      dma-direct: clean up the logic in __dma_direct_alloc_pages()

Qianfeng Rong (1):
      swiotlb: Remove redundant __GFP_NOWARN

 Documentation/core-api/dma-api.rst        |   4 +-
 Documentation/core-api/dma-attributes.rst |  18 +++++
 arch/powerpc/kernel/dma-iommu.c           |   4 +-
 drivers/iommu/dma-iommu.c                 |  61 ++++++++--------
 drivers/virtio/virtio_ring.c              |   4 +-
 drivers/xen/swiotlb-xen.c                 |  21 +++++-
 include/linux/dma-direct.h                |   2 -
 include/linux/dma-map-ops.h               |   8 +--
 include/linux/dma-mapping.h               |  33 +++++++++
 include/linux/iommu-dma.h                 |  11 +--
 include/linux/kmsan.h                     |   9 ++-
 include/linux/page-flags.h                |   1 +
 include/trace/events/dma.h                |   9 ++-
 kernel/dma/debug.c                        |  82 ++++++----------------
 kernel/dma/debug.h                        |  37 ++--------
 kernel/dma/direct.c                       |  53 +++++---------
 kernel/dma/direct.h                       |  57 +++++++++------
 kernel/dma/mapping.c                      | 112 ++++++++++++++++++------------
 kernel/dma/ops_helpers.c                  |   6 +-
 kernel/dma/swiotlb.c                      |   2 +-
 mm/hmm.c                                  |  19 ++---
 mm/kmsan/hooks.c                          |  13 ++--
 rust/kernel/dma.rs                        |   3 +
 tools/virtio/linux/kmsan.h                |   2 +-
 24 files changed, 295 insertions(+), 276 deletions(-)
----------------------------------------------------------------

Thanks!

Best regards
Marek Szyprowski, PhD
Samsung R&D Institute Poland