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    Subject[PATCH v2 0/5] enhance DMA CMA on x86
    Date
    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@samsung.com>
    Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Cc: David Woodhouse <dwmw2@infradead.org>
    Cc: Don Dutile <ddutile@redhat.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Andi Kleen <andi@firstfloor.org>
    Cc: x86@kernel.org
    Cc: iommu@lists.linux-foundation.org
    --
    1.8.3.2



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