use generic DMA mapping code in powerpc V7

[Christoph Hellwig]

Hi all,

this series switches the powerpc port to use the generic swiotlb and
noncoherent dma ops, and to use more generic code for the coherent
direct mapping, as well as removing a lot of dead code.

As this series is very large and depends on the dma-mapping tree I've
also published a git tree:

    git://git.infradead.org/users/hch/misc.git powerpc-dma.7

Gitweb:

    http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/powerpc-dma.7

Thanks a lot to Christian Zigotzky who spent a lot of time testing
iterations on pasemi and FSL boards!


Changes since v4:
 - rebased on top of the latests powerpc/next tree
 - fix the DART IOMMU bypass selection
 - remove the return value from arch_dma_set_mask, which was done
   incorrectly and isn't actually needed.
 - add a new patch to remove swiotlb_dma_supported
 - add a new patch to set a dma mask in the pasemi ethernet driver,
   given that we now validate it
 - add a new patch to fix a ZONE_DMA32 assumption in the dma-direct
   patch
 - split up a few patches to improve bisectability
 (v5 and v6 were never posted)

Changes since v3:
 - rebase on the powerpc fixes tree
 - add a new patch to actually make the baseline amigaone config
   configure without warnings
 - only use ZONE_DMA for 64-bit embedded CPUs, on pseries an IOMMU is
   always present
 - fix compile in mem.c for one configuration
 - drop the full npu removal for now, will be resent separately
 - a few git bisection fixes

The changes since v1 are to big to list and v2 was not posted in public.

 arch/powerpc/kernel/dma.c                       |  362 ------------------------
 b/arch/powerpc/Kconfig                          |    5 
 b/arch/powerpc/include/asm/device.h             |   10 
 b/arch/powerpc/include/asm/dma-direct.h         |   18 -
 b/arch/powerpc/include/asm/dma-mapping.h        |   92 ------
 b/arch/powerpc/include/asm/iommu.h              |   17 +
 b/arch/powerpc/include/asm/machdep.h            |    4 
 b/arch/powerpc/include/asm/pci-bridge.h         |    5 
 b/arch/powerpc/include/asm/pci.h                |    2 
 b/arch/powerpc/include/asm/pgtable.h            |    1 
 b/arch/powerpc/include/asm/swiotlb.h            |    5 
 b/arch/powerpc/kernel/Makefile                  |    3 
 b/arch/powerpc/kernel/dma-iommu.c               |   75 ++++
 b/arch/powerpc/kernel/dma-mask.c                |   12 
 b/arch/powerpc/kernel/dma-swiotlb.c             |   89 -----
 b/arch/powerpc/kernel/pci-common.c              |   10 
 b/arch/powerpc/kernel/setup-common.c            |    1 
 b/arch/powerpc/mm/dma-noncoherent.c             |   40 +-
 b/arch/powerpc/mm/mem.c                         |   22 -
 b/arch/powerpc/platforms/44x/ppc476.c           |    1 
 b/arch/powerpc/platforms/44x/warp.c             |    2 
 b/arch/powerpc/platforms/85xx/corenet_generic.c |    5 
 b/arch/powerpc/platforms/85xx/ge_imp3a.c        |    2 
 b/arch/powerpc/platforms/85xx/mpc8536_ds.c      |    2 
 b/arch/powerpc/platforms/85xx/mpc85xx_ds.c      |    4 
 b/arch/powerpc/platforms/85xx/mpc85xx_mds.c     |    4 
 b/arch/powerpc/platforms/85xx/p1010rdb.c        |    1 
 b/arch/powerpc/platforms/85xx/p1022_ds.c        |    2 
 b/arch/powerpc/platforms/85xx/p1022_rdk.c       |    2 
 b/arch/powerpc/platforms/85xx/qemu_e500.c       |    1 
 b/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c    |    1 
 b/arch/powerpc/platforms/Kconfig.cputype        |    3 
 b/arch/powerpc/platforms/cell/iommu.c           |  172 +----------
 b/arch/powerpc/platforms/pasemi/iommu.c         |    2 
 b/arch/powerpc/platforms/pasemi/setup.c         |   51 ---
 b/arch/powerpc/platforms/powernv/npu-dma.c      |    2 
 b/arch/powerpc/platforms/powernv/pci-ioda.c     |  132 +-------
 b/arch/powerpc/platforms/pseries/iommu.c        |   99 +-----
 b/arch/powerpc/platforms/pseries/vio.c          |   95 ++----
 b/arch/powerpc/sysdev/dart_iommu.c              |   58 +--
 b/arch/powerpc/sysdev/fsl_pci.c                 |   25 -
 b/drivers/misc/cxl/vphb.c                       |    3 
 b/drivers/net/ethernet/pasemi/pasemi_mac.c      |    1 
 b/include/linux/swiotlb.h                       |    3 
 b/kernel/dma/Kconfig                            |    3 
 b/kernel/dma/direct.c                           |    3 
 b/kernel/dma/mapping.c                          |   11 
 b/kernel/dma/swiotlb.c                          |   12 
 48 files changed, 317 insertions(+), 1158 deletions(-)