The first 21 patches in the set add support for the DMA attribute
DMA_ATTR_SKIP_CPU_SYNC on multiple platforms/architectures. This is needed
so that we can flag the calls to dma_map/unmap_page so that we do not
invalidate cache lines that do not currently belong to the device. Instead
we have to take care of this in the driver via a call to
sync_single_range_for_cpu prior to freeing the Rx page.
Patch 22 adds support for dma_map_page_attrs and dma_unmap_page_attrs so
that we can unmap and map a page using the DMA_ATTR_SKIP_CPU_SYNC
attribute.
Patch 23 adds support for freeing a page that has multiple references being
held by a single caller. This way we can free page fragments that were
allocated by a given driver.
The last 3 patches use these updates in the igb driver to allow for us to
reimplement the use of build_skb which hands a writable page off to the
stack.
My hope is to get the series accepted into the net-next tree as I have a
number of other Intel drivers I could then begin updating once these
patches are accepted.
Any feedback is welcome. Specifically if there is something I overlooked
design-wise or an architecture I missed please let me know and I will add
it to this patch set. If needed I can look into breaking this into a
smaller set of patches but this set is all that should be needed to then
start looking at putting together a DMA page pool per device which I know
is something Jesper has been working on.
---
Alexander Duyck (26):
swiotlb: Drop unused function swiotlb_map_sg
swiotlb: Add support for DMA_ATTR_SKIP_CPU_SYNC
arch/arc: Add option to skip sync on DMA mapping
arch/arm: Add option to skip sync on DMA map and unmap
arch/avr32: Add option to skip sync on DMA map
arch/blackfin: Add option to skip sync on DMA map
arch/c6x: Add option to skip sync on DMA map and unmap
arch/frv: Add option to skip sync on DMA map
arch/hexagon: Add option to skip DMA sync as a part of mapping
arch/m68k: Add option to skip DMA sync as a part of mapping
arch/metag: Add option to skip DMA sync as a part of map and unmap
arch/microblaze: Add option to skip DMA sync as a part of map and unmap
arch/mips: Add option to skip DMA sync as a part of map and unmap
arch/nios2: Add option to skip DMA sync as a part of map and unmap
arch/openrisc: Add option to skip DMA sync as a part of mapping
arch/parisc: Add option to skip DMA sync as a part of map and unmap
arch/powerpc: Add option to skip DMA sync as a part of mapping
arch/sh: Add option to skip DMA sync as a part of mapping
arch/sparc: Add option to skip DMA sync as a part of map and unmap
arch/tile: Add option to skip DMA sync as a part of map and unmap
arch/xtensa: Add option to skip DMA sync as a part of mapping
dma: Add calls for dma_map_page_attrs and dma_unmap_page_attrs
mm: Add support for releasing multiple instances of a page
igb: Update driver to make use of DMA_ATTR_SKIP_CPU_SYNC
igb: Update code to better handle incrementing page count
igb: Revert "igb: Revert support for build_skb in igb"
arch/arc/mm/dma.c | 3
arch/arm/common/dmabounce.c | 16 +-
arch/avr32/mm/dma-coherent.c | 7 +
arch/blackfin/kernel/dma-mapping.c | 7 +
arch/c6x/kernel/dma.c | 16 ++
arch/frv/mb93090-mb00/pci-dma-nommu.c | 16 ++
arch/frv/mb93090-mb00/pci-dma.c | 7 +
arch/hexagon/kernel/dma.c | 6 +
arch/m68k/kernel/dma.c | 8 +
arch/metag/kernel/dma.c | 16 ++
arch/microblaze/kernel/dma.c | 10 +
arch/mips/loongson64/common/dma-swiotlb.c | 2
arch/mips/mm/dma-default.c | 8 +
arch/nios2/mm/dma-mapping.c | 14 ++
arch/openrisc/kernel/dma.c | 3
arch/parisc/kernel/pci-dma.c | 20 ++-
arch/powerpc/kernel/dma.c | 9 +
arch/sh/kernel/dma-nommu.c | 7 +
arch/sparc/kernel/iommu.c | 4 -
arch/sparc/kernel/ioport.c | 4 -
arch/tile/kernel/pci-dma.c | 12 +-
arch/xtensa/kernel/pci-dma.c | 7 +
drivers/net/ethernet/intel/igb/igb.h | 36 ++++-
drivers/net/ethernet/intel/igb/igb_main.c | 207 +++++++++++++++++++++++------
drivers/xen/swiotlb-xen.c | 40 +++---
include/linux/dma-mapping.h | 20 ++-
include/linux/gfp.h | 2
include/linux/swiotlb.h | 10 +
lib/swiotlb.c | 56 ++++----
mm/page_alloc.c | 14 ++
30 files changed, 435 insertions(+), 152 deletions(-)
--
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