[PATCH v2 0/5] enhance DMA CMA on x86

[Akinobu Mita]

This patch set enhances the DMA Contiguous Memory Allocator on x86.

Currently the DMA CMA is only supported with pci-nommu dma_map_ops
and furthermore it can't be enabled on x86_64.  But I would like to
allocate big contiguous memory with dma_alloc_coherent() and tell it
to the device that requires it, regardless of which dma mapping
implementation is actually used in the system.

So this makes it work with swiotlb and intel-iommu dma_map_ops, too.
And this also extends "cma=" kernel parameter to specify placement
constraint by the physical address range of memory allocations.  For
example, CMA allocates memory below 4GB by "cma=64M@0-4G", it is
required for the devices only supporting 32-bit addressing on 64-bit
systems without iommu.

* Changes from v1
- fix dma_alloc_coherent() with __GFP_ZERO
- add placement specifier for "cma=" kernel parameter

Akinobu Mita (5):
  x86: make dma_alloc_coherent() return zeroed memory if CMA is enabled
  x86: enable DMA CMA with swiotlb
  intel-iommu: integrate DMA CMA
  memblock: introduce memblock_alloc_range()
  cma: add placement specifier for "cma=" kernel parameter

 Documentation/kernel-parameters.txt |  7 +++++--
 arch/x86/Kconfig                    |  2 +-
 arch/x86/include/asm/swiotlb.h      |  7 +++++++
 arch/x86/kernel/amd_gart_64.c       |  2 +-
 arch/x86/kernel/pci-dma.c           |  3 +--
 arch/x86/kernel/pci-swiotlb.c       |  9 +++++---
 arch/x86/pci/sta2x11-fixup.c        |  6 ++----
 drivers/base/dma-contiguous.c       | 42 ++++++++++++++++++++++++++++---------
 drivers/iommu/intel-iommu.c         | 32 +++++++++++++++++++++-------
 include/linux/dma-contiguous.h      |  9 +++++---
 include/linux/memblock.h            |  2 ++
 include/linux/swiotlb.h             |  2 ++
 lib/swiotlb.c                       |  2 +-
 mm/memblock.c                       | 27 +++++++++++++++++-------
 14 files changed, 110 insertions(+), 42 deletions(-)

Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Don Dutile <ddutile@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
-- 
1.8.3.2

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