[PATCHv6 0/8] blk dma iter for integrity metadata

[Keith Busch]

From: Keith Busch <kbusch at kernel.org>

Previous version:

  https://lore.kernel.org/linux-block/20250808155826.1864803-1-kbusch@meta.com/

Changes since v5, addressing review feedback from Christoph:

  - Keep the phys_vec, create a different iterator for the lower layer
    separated from the phys_vec

  - Commit log changes describing the bvec array being iterated.

  - Rename the blk_map_iter initialiation function; take a pointer
    instead of returning a copy; make it inline

  - Rename the bvec pointer being iterated to "bvecs"

  - Have bio-integrity legacy scatter-gather iteration subscribe to the
    new dma api. This required relocating some inline functions to
    header files.

  - Using 'bio_integrity()' to avoid needing "#ifdef CONFIG_" usage

  - Kernel doc for integrity dma mapping APIs

  - nvme comment explaining when we do or don't use MPTR format

  - Various nvme code cleanups

Keith Busch (8):
  blk-mq-dma: create blk_map_iter type
  blk-mq-dma: provide the bio_vec array being iterated
  blk-mq-dma: require unmap caller provide p2p map type
  blk-mq: remove REQ_P2PDMA flag
  blk-mq-dma: move common dma start code to a helper
  blk-mq-dma: add support for mapping integrity metadata
  nvme-pci: create common sgl unmapping helper
  nvme-pci: convert metadata mapping to dma iter

 block/bio.c                   |   2 +-
 block/blk-integrity.c         |  43 +++---
 block/blk-mq-dma.c            | 251 +++++++++++++++++++++++-----------
 block/blk-mq.h                |  26 ++++
 drivers/nvme/host/pci.c       | 213 +++++++++++++++++------------
 include/linux/blk-integrity.h |  17 +++
 include/linux/blk-mq-dma.h    |  14 +-
 include/linux/blk_types.h     |   2 -
 8 files changed, 364 insertions(+), 204 deletions(-)

-- 
2.47.3