[PATCH v2 0/2] block: Enable proper MMIO memory handling for P2P DMA

[Leon Romanovsky]

Changelog:
v2:
 * Added Chirstoph's Reviewed-by tag for first patch.
 * Squashed patches
 * Stored DMA MMIO attribute in NVMe IOD flags variable instead of block layer.
v1: https://patch.msgid.link/20251017-block-with-mmio-v1-0-3f486904db5e@nvidia.com
 * Reordered patches.
 * Dropped patch which tried to unify unmap flow.
 * Set MMIO flag separately for data and integrity payloads.
v0: https://lore.kernel.org/all/cover.1760369219.git.leon@kernel.org/

----------------------------------------------------------------------

This patch series improves block layer and NVMe driver support for MMIO
memory regions, particularly for peer-to-peer (P2P) DMA transfers that
go through the host bridge.

The series addresses a critical gap where P2P transfers through the host
bridge (PCI_P2PDMA_MAP_THRU_HOST_BRIDGE) were not properly marked as
MMIO memory, leading to potential issues with:

- Inappropriate CPU cache synchronization operations on MMIO regions
- Incorrect DMA mapping/unmapping that doesn't respect MMIO semantics  
- Missing IOMMU configuration for MMIO memory handling

This work is extracted from the larger DMA physical API improvement
series [1] and focuses specifically on block layer and NVMe requirements
for MMIO memory support.

Thanks

[1] https://lore.kernel.org/all/cover.1757423202.git.leonro@nvidia.com/

---
Leon Romanovsky (2):
      nvme-pci: migrate to dma_map_phys instead of map_page
      block-dma: properly take MMIO path

 block/blk-mq-dma.c            |  8 ++++---
 drivers/nvme/host/pci.c       | 50 +++++++++++++++++++++++++++++++------------
 include/linux/blk-integrity.h |  7 +++---
 include/linux/blk-mq-dma.h    | 12 +++++++----
 4 files changed, 53 insertions(+), 24 deletions(-)
---
base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
change-id: 20251016-block-with-mmio-02acf4285427

Best regards,
--  
Leon Romanovsky <leonro at nvidia.com>