[PATCH 00/11] dma-mapping: add dma_alloc_attrs_node() and dma_alloc_coherent_node()

[Jakub Kicinski <kuba@kernel.org>]

Hi!

On NUMA systems networking drivers want to allocate rings
and buffers close to the NAPI-handling core rather than
allocating all from where the device is connected.

Looks like we have accumulated 6 drivers which do:

       set_dev_node(dma_dev, numa_node);
       va = dma_alloc_coherent(...);
       set_dev_node(dma_dev, old_node);

Introduce dma_alloc_coherent_node() so that such racy
hacks are no longer necessary.

Note that making dma_map_ops->alloc() callbacks explicit-node-aware
is left for future work.

Stable tag on top of v7.4-rc1, so that we can also pull this into
the networking tree:

  git://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux.git tags/dma_alloc_coherent_node

v1:
 - add the API first, then wire up the node in dma-direct, iommu-dma
   and CMA (Robin)
 - add dma_direct_alloc_node() and keep dma_direct_alloc() as a wrapper,
   swiotlb-xen uses it as its ->alloc (fixes the build on arm/arm64),
   arch/x86 no longer needs changes
 - docs: drop the NUMA_NO_NODE suggestion from dma-api.rst (Björn)
 - docs: document that CMA does not fall back to other nodes' areas (Björn)
 - docs: document which allocations ignore the node
 - explain the separate GPL-only export in the commit message (Marek)
rfc: https://lore.kernel.org/20261027022528.633359-1-kuba@kernel.org

Jakub Kicinski (11):
  dma-mapping: add dma_alloc_attrs_node() and dma_alloc_coherent_node()
  dma-direct: add dma_direct_alloc_node()
  iommu/dma: pass the NUMA node to iommu_dma_alloc()
  dma-contiguous: pass the NUMA node to dma_alloc_contiguous()
  eth: libwx: restore the device's NUMA node after ring allocation
  eth: libwx: use dma_alloc_coherent_node()
  eth: ixgbe: use dma_alloc_coherent_node()
  eth: xgbe: use dma_alloc_coherent_node()
  eth: fungible: use dma_alloc_coherent_node()
  eth: mlx5: use dma_alloc_coherent_node()
  eth: mlx4: use dma_alloc_coherent_node()

 Documentation/core-api/dma-api.rst            | 17 ++++++++
 include/linux/dma-direct.h                    | 11 ++++-
 include/linux/dma-map-ops.h                   |  5 ++-
 include/linux/dma-mapping.h                   | 14 +++++++
 include/linux/iommu-dma.h                     |  2 +-
 include/linux/mlx4/device.h                   |  2 +-
 include/linux/mlx5/driver.h                   |  2 -
 drivers/iommu/dma-iommu.c                     | 30 ++++++++------
 drivers/net/ethernet/amd/xgbe/xgbe-desc.c     |  6 +--
 .../net/ethernet/fungible/funcore/fun_queue.c |  8 ++--
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 20 +++-------
 drivers/net/ethernet/mellanox/mlx4/alloc.c    | 12 +++---
 drivers/net/ethernet/mellanox/mlx4/en_cq.c    |  9 +----
 .../net/ethernet/mellanox/mlx4/en_netdev.c    |  2 +-
 drivers/net/ethernet/mellanox/mlx4/en_rx.c    |  5 +--
 drivers/net/ethernet/mellanox/mlx4/en_tx.c    |  5 +--
 .../net/ethernet/mellanox/mlx5/core/alloc.c   | 24 ++---------
 .../net/ethernet/mellanox/mlx5/core/main.c    |  4 --
 drivers/net/ethernet/wangxun/libwx/wx_lib.c   | 22 ++++------
 kernel/dma/contiguous.c                       | 12 +++---
 kernel/dma/direct.c                           | 22 +++++-----
 kernel/dma/mapping.c                          | 40 +++++++++++++++++--
 kernel/dma/ops_helpers.c                      |  5 ++-
 23 files changed, 152 insertions(+), 127 deletions(-)

-- 
2.56.0