[PATCH 0/5 v5] Fix virtio-blk issue with SWIOTLB

[Joerg Roedel <joro@8bytes.org>]

Hi,

here is the next version of this patch-set. Previous
versions can be found here:

	V1: https://lore.kernel.org/lkml/20190110134433.15672-1-joro@8bytes.org/

	V2: https://lore.kernel.org/lkml/20190115132257.6426-1-joro@8bytes.org/

	V3: https://lore.kernel.org/lkml/20190123163049.24863-1-joro@8bytes.org/

	V4: https://lore.kernel.org/lkml/20190129084342.26030-1-joro@8bytes.org/

The problem solved here is a limitation of the SWIOTLB implementation,
which does not support allocations larger than 256kb.  When the
virtio-blk driver tries to read/write a block larger than that, the
allocation of the dma-handle fails and an IO error is reported.

Changes to v4 are:

	- Added Reviewed-by tags from Christoph

	- Added missing EXPORT_SYMBOL(_GPL) lines

Please review.

Thanks,

	Joerg
Joerg Roedel (5):
  swiotlb: Introduce swiotlb_max_mapping_size()
  swiotlb: Add is_swiotlb_active() function
  dma: Introduce dma_max_mapping_size()
  virtio: Introduce virtio_max_dma_size()
  virtio-blk: Consider virtio_max_dma_size() for maximum segment size

 Documentation/DMA-API.txt    |  8 ++++++++
 drivers/block/virtio_blk.c   | 10 ++++++----
 drivers/virtio/virtio_ring.c | 11 +++++++++++
 include/linux/dma-mapping.h  | 16 ++++++++++++++++
 include/linux/swiotlb.h      | 11 +++++++++++
 include/linux/virtio.h       |  2 ++
 kernel/dma/direct.c          | 12 ++++++++++++
 kernel/dma/swiotlb.c         | 14 ++++++++++++++
 8 files changed, 80 insertions(+), 4 deletions(-)

-- 
2.17.1