[PATCH v3 0/4] dma-mapping: introduce new dma unmap and sync variants

[Laurentiu Tudor]

From: Laurentiu Tudor <laurentiu.tudor@xxxxxxx>

This series introduces a few new dma unmap and sync api variants that,
on top of what the originals do, return the virtual address
corresponding to the input dma address. In order to do that a new dma
map op is added, .get_virt_addr that takes the input dma address and
returns the virtual address backing it up.
The second patch adds an implementation for this new dma map op in the
generic iommu dma glue code and wires it in.
The third patch updates the dpaa2-eth driver to use the new apis.

Context: https://lkml.org/lkml/2019/5/31/684

Changes in v3
 * drop useless check for null iommu domain (Robin)
 * add dma_can_unmap_by_dma_addr() to check availability of
   these new apis (Christoph)
 * make apis work with direct dma (Christoph)
 * add support for swiotlb (Robin)
 * simplify dpaa2_eth driver code by using dma_unmap_single_desc()
   instead of dma_unmap_page_desc()

Changes in v2
 * use "dma_unmap_*_desc" names (Robin)
 * return va/page instead of phys addr (Robin)

Changes since RFC
 * completely changed the approach: added unmap and sync variants that
   return the phys addr instead of adding a new dma to phys conversion
   function

Laurentiu Tudor (4):
  dma-mapping: introduce new dma unmap and sync api variants
  iommu/dma: wire-up new dma map op .get_virt_addr
  swiotlb: make new {unmap,sync}_desc dma apis work with swiotlb
  dpaa2_eth: use new unmap and sync dma api variants

 drivers/iommu/dma-iommu.c                     | 13 ++++
 .../net/ethernet/freescale/dpaa2/dpaa2-eth.c  | 43 +++++-----
 .../net/ethernet/freescale/dpaa2/dpaa2-eth.h  |  1 -
 include/linux/dma-mapping.h                   | 45 +++++++++++
 include/linux/swiotlb.h                       |  7 ++
 kernel/dma/mapping.c                          | 78 +++++++++++++++++++
 kernel/dma/swiotlb.c                          |  8 ++
 7 files changed, 169 insertions(+), 26 deletions(-)

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2.17.1