[PATCH v4 00/44] dma-mapping: Use unsigned long for dma_attrs

Krzysztof Kozlowski
2016-06-10T10:12:23Z

Hi,

This is fourth approach for replacing struct dma_attrs with unsigned
long.

The main patch (1/44) doing the change is split into many subpatches
for easier review (2-42). They should be squashed together when
applying.

*Important:* Patchset is tested on my ARM platforms and *only* build
tested on allyesconfigs: ARM, ARM64, i386, x86_64 and powerpc.
Please kindly provide reviewes and tests for other platforms.

Rebased on next-20160607.

For easier testing the patchset is available here:
repo: https://github.com/krzk/linux
branch: for-next/dma-attrs-const-v4

Changes since v3
================
1. Collect some acks.
2. Drop wrong patch 1/45 ("powerpc: dma-mapping: Don't hard-code
the value of DMA_ATTR_WEAK_ORDERING").
3. Minor fix pointed out by Michael Ellerman.

Changes since v2
================
1. Follow Christoph Hellwig's comments (don't use BIT add
documentation, remove dma_get_attr).

Rationale
=========
The dma-mapping core and the implementations do not change the
DMA attributes passed by pointer. Thus the pointer can point to const
data. However the attributes do not have to be a bitfield. Instead
unsigned long will do fine:

1. This is just simpler. Both in terms of reading the code and setting
attributes. Instead of initializing local attributes on the stack
and passing pointer to it to dma_set_attr(), just set the bits.

2. It brings safeness and checking for const correctness because the
attributes are passed by value.

Best regards,
Krzysztof

Krzysztof Kozlowski (44):
dma-mapping: Use unsigned long for dma_attrs
alpha: dma-mapping: Use unsigned long for dma_attrs
arc: dma-mapping: Use unsigned long for dma_attrs
ARM: dma-mapping: Use unsigned long for dma_attrs
arm64: dma-mapping: Use unsigned long for dma_attrs
avr32: dma-mapping: Use unsigned long for dma_attrs
blackfin: dma-mapping: Use unsigned long for dma_attrs
c6x: dma-mapping: Use unsigned long for dma_attrs
cris: dma-mapping: Use unsigned long for dma_attrs
frv: dma-mapping: Use unsigned long for dma_attrs
drm/exynos: dma-mapping: Use unsigned long for dma_attrs
drm/mediatek: dma-mapping: Use unsigned long for dma_attrs
drm/msm: dma-mapping: Use unsigned long for dma_attrs
drm/nouveau: dma-mapping: Use unsigned long for dma_attrs
drm/rockship: dma-mapping: Use unsigned long for dma_attrs
infiniband: dma-mapping: Use unsigned long for dma_attrs
iommu: dma-mapping: Use unsigned long for dma_attrs
[media] dma-mapping: Use unsigned long for dma_attrs
xen: dma-mapping: Use unsigned long for dma_attrs
swiotlb: dma-mapping: Use unsigned long for dma_attrs
powerpc: dma-mapping: Use unsigned long for dma_attrs
video: dma-mapping: Use unsigned long for dma_attrs
x86: dma-mapping: Use unsigned long for dma_attrs
iommu: intel: dma-mapping: Use unsigned long for dma_attrs
h8300: dma-mapping: Use unsigned long for dma_attrs
hexagon: dma-mapping: Use unsigned long for dma_attrs
ia64: dma-mapping: Use unsigned long for dma_attrs
m68k: dma-mapping: Use unsigned long for dma_attrs
metag: dma-mapping: Use unsigned long for dma_attrs
microblaze: dma-mapping: Use unsigned long for dma_attrs
mips: dma-mapping: Use unsigned long for dma_attrs
mn10300: dma-mapping: Use unsigned long for dma_attrs
nios2: dma-mapping: Use unsigned long for dma_attrs
openrisc: dma-mapping: Use unsigned long for dma_attrs
parisc: dma-mapping: Use unsigned long for dma_attrs
misc: mic: dma-mapping: Use unsigned long for dma_attrs
s390: dma-mapping: Use unsigned long for dma_attrs
sh: dma-mapping: Use unsigned long for dma_attrs
sparc: dma-mapping: Use unsigned long for dma_attrs
tile: dma-mapping: Use unsigned long for dma_attrs
unicore32: dma-mapping: Use unsigned long for dma_attrs
xtensa: dma-mapping: Use unsigned long for dma_attrs
dma-mapping: Remove dma_get_attr
dma-mapping: Document the DMA attributes next to the declaration

Documentation/DMA-API.txt | 33 +++---
Documentation/DMA-attributes.txt | 2 +-
arch/alpha/include/asm/dma-mapping.h | 2 -
arch/alpha/kernel/pci-noop.c | 2 +-
arch/alpha/kernel/pci_iommu.c | 12 +-
arch/arc/mm/dma.c | 12 +-
arch/arm/common/dmabounce.c | 4 +-
arch/arm/include/asm/dma-mapping.h | 13 +--
arch/arm/include/asm/xen/page-coherent.h | 16 +--
arch/arm/mm/dma-mapping.c | 121 ++++++++++---------
arch/arm/xen/mm.c | 8 +-
arch/arm64/mm/dma-mapping.c | 67 +++++------
arch/avr32/mm/dma-coherent.c | 12 +-
arch/blackfin/kernel/dma-mapping.c | 8 +-
arch/c6x/include/asm/dma-mapping.h | 4 +-
arch/c6x/kernel/dma.c | 9 +-
arch/c6x/mm/dma-coherent.c | 4 +-
arch/cris/arch-v32/drivers/pci/dma.c | 9 +-
arch/frv/mb93090-mb00/pci-dma-nommu.c | 8 +-
arch/frv/mb93090-mb00/pci-dma.c | 9 +-
arch/h8300/kernel/dma.c | 8 +-
arch/hexagon/include/asm/dma-mapping.h | 1 -
arch/hexagon/kernel/dma.c | 8 +-
arch/ia64/hp/common/sba_iommu.c | 22 ++--
arch/ia64/include/asm/machvec.h | 1 -
arch/ia64/kernel/pci-swiotlb.c | 4 +-
arch/ia64/sn/pci/pci_dma.c | 22 ++--
arch/m68k/kernel/dma.c | 12 +-
arch/metag/kernel/dma.c | 16 +--
arch/microblaze/include/asm/dma-mapping.h | 1 -
arch/microblaze/kernel/dma.c | 12 +-
arch/mips/cavium-octeon/dma-octeon.c | 8 +-
arch/mips/loongson64/common/dma-swiotlb.c | 10 +-
arch/mips/mm/dma-default.c | 20 ++--
arch/mips/netlogic/common/nlm-dma.c | 4 +-
arch/mn10300/mm/dma-alloc.c | 8 +-
arch/nios2/mm/dma-mapping.c | 12 +-
arch/openrisc/kernel/dma.c | 21 ++--
arch/parisc/kernel/pci-dma.c | 18 +--
arch/powerpc/include/asm/dma-mapping.h | 7 +-
arch/powerpc/include/asm/iommu.h | 10 +-
arch/powerpc/kernel/dma-iommu.c | 12 +-
arch/powerpc/kernel/dma.c | 18 +--
arch/powerpc/kernel/ibmebus.c | 12 +-
arch/powerpc/kernel/iommu.c | 12 +-
arch/powerpc/kernel/vio.c | 12 +-
arch/powerpc/platforms/cell/iommu.c | 28 ++---
arch/powerpc/platforms/pasemi/iommu.c | 2 +-
arch/powerpc/platforms/powernv/npu-dma.c | 8 +-
arch/powerpc/platforms/powernv/pci-ioda.c | 4 +-
arch/powerpc/platforms/powernv/pci.c | 2 +-
arch/powerpc/platforms/powernv/pci.h | 2 +-
arch/powerpc/platforms/ps3/system-bus.c | 18 +--
arch/powerpc/platforms/pseries/iommu.c | 6 +-
arch/powerpc/sysdev/dart_iommu.c | 2 +-
arch/s390/include/asm/dma-mapping.h | 1 -
arch/s390/pci/pci_dma.c | 23 ++--
arch/sh/include/asm/dma-mapping.h | 4 +-
arch/sh/kernel/dma-nommu.c | 4 +-
arch/sh/mm/consistent.c | 4 +-
arch/sparc/kernel/iommu.c | 12 +-
arch/sparc/kernel/ioport.c | 24 ++--
arch/sparc/kernel/pci_sun4v.c | 12 +-
arch/tile/kernel/pci-dma.c | 28 ++---
arch/unicore32/mm/dma-swiotlb.c | 4 +-
arch/x86/include/asm/dma-mapping.h | 5 +-
arch/x86/include/asm/swiotlb.h | 4 +-
arch/x86/include/asm/xen/page-coherent.h | 9 +-
arch/x86/kernel/amd_gart_64.c | 20 ++--
arch/x86/kernel/pci-calgary_64.c | 14 +--
arch/x86/kernel/pci-dma.c | 4 +-
arch/x86/kernel/pci-nommu.c | 4 +-
arch/x86/kernel/pci-swiotlb.c | 4 +-
arch/x86/pci/sta2x11-fixup.c | 2 +-
arch/x86/pci/vmd.c | 16 +--
arch/xtensa/kernel/pci-dma.c | 12 +-
drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 2 +-
drivers/gpu/drm/exynos/exynos_drm_g2d.c | 12 +-
drivers/gpu/drm/exynos/exynos_drm_gem.c | 20 ++--
drivers/gpu/drm/exynos/exynos_drm_gem.h | 2 +-
drivers/gpu/drm/mediatek/mtk_drm_gem.c | 13 +--
drivers/gpu/drm/mediatek/mtk_drm_gem.h | 2 +-
drivers/gpu/drm/msm/msm_drv.c | 13 +--
.../gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c | 13 +--
drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 17 ++-
drivers/gpu/drm/rockchip/rockchip_drm_gem.h | 2 +-
drivers/infiniband/core/umem.c | 7 +-
drivers/iommu/amd_iommu.c | 12 +-
drivers/iommu/dma-iommu.c | 8 +-
drivers/iommu/intel-iommu.c | 12 +-
drivers/media/platform/sti/bdisp/bdisp-hw.c | 26 ++---
drivers/media/v4l2-core/videobuf2-dma-contig.c | 30 ++---
drivers/media/v4l2-core/videobuf2-dma-sg.c | 19 +--
drivers/misc/mic/host/mic_boot.c | 20 ++--
drivers/parisc/ccio-dma.c | 16 +--
drivers/parisc/sba_iommu.c | 16 +--
drivers/video/fbdev/omap2/omapfb/omapfb-main.c | 12 +-
drivers/video/fbdev/omap2/omapfb/omapfb.h | 3 +-
drivers/xen/swiotlb-xen.c | 14 +--
include/linux/dma-attrs.h | 72 ------------
include/linux/dma-iommu.h | 6 +-
include/linux/dma-mapping.h | 128 ++++++++++++++-------
include/linux/swiotlb.h | 10 +-
include/media/videobuf2-dma-contig.h | 7 +-
include/rdma/ib_verbs.h | 8 +-
include/xen/swiotlb-xen.h | 12 +-
lib/dma-noop.c | 9 +-
lib/swiotlb.c | 13 ++-
108 files changed, 691 insertions(+), 793 deletions(-)
delete mode 100644 include/linux/dma-attrs.h

--
1.9.1