The first 19 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 20 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 21 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 2 patches use these updates in the igb driver, and lay the
groundwork to allow for us to reimplement the use of build_skb.
v1: Minor fixes based on issues found by kernel build bot
Few minor changes for issues found on code review
Added Acked-by for patches that were acked and not changed
v2: Added a few more Acked-by
Submitting patches to mm instead of net-next
v3: Added Acked-by for PowerPC architecture
Dropped first 3 patches which were accepted into swiotlb tree
Dropped comments describing swiotlb changes.
---
Alexander Duyck (23):
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
arch/arc/mm/dma.c | 5 ++
arch/arm/common/dmabounce.c | 16 ++++--
arch/avr32/mm/dma-coherent.c | 7 ++-
arch/blackfin/kernel/dma-mapping.c | 8 +++
arch/c6x/kernel/dma.c | 14 ++++-
arch/frv/mb93090-mb00/pci-dma-nommu.c | 14 ++++-
arch/frv/mb93090-mb00/pci-dma.c | 9 +++
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 | 26 +++++++---
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 | 7 ++-
drivers/net/ethernet/intel/igb/igb_main.c | 77 +++++++++++++++++++----------
include/linux/dma-mapping.h | 20 +++++---
include/linux/gfp.h | 2 +
mm/page_alloc.c | 14 +++++
27 files changed, 246 insertions(+), 89 deletions(-)
--
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