[PATCH v2 00/26] IB: Optimize DMA mapping

From: Bart Van Assche
Date: Thu Jan 12 2017 - 14:08:30 EST

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Hello Doug,

As you know there are two sets of DMA mapping operations in the Linux
kernel:
- One set of DMA mapping operations that is used by most drivers.
- Another set of DMA mapping operations that is only used by the RDMA
drivers.
Having two sets of DMA mapping operations is not only a source of
confusion but also a source of unnecessary overhead. The DMA mapping
operations are in the hot path so it is important that the overhead
of these operations is as low as possible. Hence this patch series
that converts the RDMA code to the standard DMA mapping API and
thereby eliminates the if (dev->dma_ops) test from the hot path. An
additional benefit is that the size of HW and SW drivers that do not
use DMA is reduced by switching to dma_virt_ops.

The changes compared to version 1 of this patch series are:
- Patch "Move dma_ops from archdata into struct device" has been
split into three patches.
- Patch "treewide: Inline ib_dma_map_*() functions" has been split
into 15 patches (one per driver).
- A patch has been added that builds dma_noop_ops only for the
architectures that need it.
- The new dma_virt_ops is only built if it is used by a driver.
- In these last 15 patches indentation has been adjusted to keep
the arguments aligned with the opening parenthesis.

Bart Van Assche (26):
treewide: Constify most dma_map_ops structures
treewide: Move dma_ops from struct dev_archdata into struct device
treewide: Consolidate set_dma_ops() implementations
treewide: Consolidate get_dma_ops() implementations
lib/dma-noop: Clarify a comment
lib/dma-noop: Only build dma_noop_ops for m32r and s390
lib/dma-virt: Add dma_virt_ops
IB/hf1: Remove DMA mapping code
IB/qib: Remove DMA mapping code
IB: Use dma_virt_ops instead of duplicating it
RDS: IB: Remove an unused structure member
IB: Convert ib_dma_*_coherent() argument type from u64 into dma_addr_t
IB/core: Inline ib_dma_map_*() functions
IB/mlx4: Inline ib_dma_map_*() functions
IB/mlx5: Inline ib_dma_map_*() functions
IB/IPoIB: Inline ib_dma_map_*() functions
IB/iser: Inline ib_dma_map_*() functions
IB/isert: Inline ib_dma_map_*() functions
IB/srp: Inline ib_dma_map_*() functions
IB/srpt: Inline ib_dma_map_*() functions
staging/lustre: Inline ib_dma_map_*() functions
nvme-rdma: Inline ib_dma_map_*() functions
net/9p: Inline ib_dma_map_*() functions
net/rds: Inline ib_dma_map_*() functions
xprtrdma: Inline ib_dma_map_*() functions
IB/core: Remove ib_dma_map_*() functions

arch/alpha/include/asm/dma-mapping.h | 4 +-
arch/alpha/kernel/pci-noop.c | 4 +-
arch/alpha/kernel/pci_iommu.c | 4 +-
arch/arc/include/asm/dma-mapping.h | 4 +-
arch/arc/mm/dma.c | 2 +-
arch/arm/common/dmabounce.c | 2 +-
arch/arm/include/asm/device.h | 1 -
arch/arm/include/asm/dma-mapping.h | 20 +-
arch/arm/mm/dma-mapping.c | 22 +-
arch/arm/xen/mm.c | 4 +-
arch/arm64/include/asm/device.h | 1 -
arch/arm64/include/asm/dma-mapping.h | 12 +-
arch/arm64/mm/dma-mapping.c | 14 +-
arch/avr32/include/asm/dma-mapping.h | 4 +-
arch/avr32/mm/dma-coherent.c | 2 +-
arch/blackfin/include/asm/dma-mapping.h | 4 +-
arch/blackfin/kernel/dma-mapping.c | 2 +-
arch/c6x/include/asm/dma-mapping.h | 4 +-
arch/c6x/kernel/dma.c | 2 +-
arch/cris/arch-v32/drivers/pci/dma.c | 2 +-
arch/cris/include/asm/dma-mapping.h | 6 +-
arch/frv/include/asm/dma-mapping.h | 4 +-
arch/frv/mb93090-mb00/pci-dma-nommu.c | 2 +-
arch/frv/mb93090-mb00/pci-dma.c | 2 +-
arch/h8300/include/asm/dma-mapping.h | 4 +-
arch/h8300/kernel/dma.c | 2 +-
arch/hexagon/include/asm/dma-mapping.h | 7 +-
arch/hexagon/kernel/dma.c | 4 +-
arch/ia64/hp/common/hwsw_iommu.c | 4 +-
arch/ia64/hp/common/sba_iommu.c | 4 +-
arch/ia64/include/asm/dma-mapping.h | 7 +-
arch/ia64/include/asm/machvec.h | 4 +-
arch/ia64/kernel/dma-mapping.c | 4 +-
arch/ia64/kernel/pci-dma.c | 10 +-
arch/ia64/kernel/pci-swiotlb.c | 2 +-
arch/m32r/Kconfig | 1 +
arch/m32r/include/asm/device.h | 1 -
arch/m32r/include/asm/dma-mapping.h | 4 +-
arch/m68k/include/asm/dma-mapping.h | 4 +-
arch/m68k/kernel/dma.c | 2 +-
arch/metag/include/asm/dma-mapping.h | 4 +-
arch/metag/kernel/dma.c | 2 +-
arch/microblaze/include/asm/dma-mapping.h | 4 +-
arch/microblaze/kernel/dma.c | 2 +-
arch/mips/cavium-octeon/dma-octeon.c | 4 +-
arch/mips/include/asm/device.h | 5 -
arch/mips/include/asm/dma-mapping.h | 9 +-
.../include/asm/mach-cavium-octeon/dma-coherence.h | 2 +-
arch/mips/include/asm/netlogic/common.h | 2 +-
arch/mips/loongson64/common/dma-swiotlb.c | 2 +-
arch/mips/mm/dma-default.c | 4 +-
arch/mips/netlogic/common/nlm-dma.c | 2 +-
arch/mips/pci/pci-octeon.c | 2 +-
arch/mn10300/include/asm/dma-mapping.h | 4 +-
arch/mn10300/mm/dma-alloc.c | 2 +-
arch/nios2/include/asm/dma-mapping.h | 4 +-
arch/nios2/mm/dma-mapping.c | 2 +-
arch/openrisc/include/asm/dma-mapping.h | 4 +-
arch/openrisc/kernel/dma.c | 2 +-
arch/parisc/include/asm/dma-mapping.h | 8 +-
arch/parisc/kernel/drivers.c | 2 +-
arch/parisc/kernel/pci-dma.c | 4 +-
arch/powerpc/include/asm/device.h | 4 -
arch/powerpc/include/asm/dma-mapping.h | 14 +-
arch/powerpc/include/asm/pci.h | 4 +-
arch/powerpc/include/asm/ps3.h | 2 +-
arch/powerpc/include/asm/swiotlb.h | 2 +-
arch/powerpc/kernel/dma-swiotlb.c | 2 +-
arch/powerpc/kernel/dma.c | 8 +-
arch/powerpc/kernel/pci-common.c | 6 +-
arch/powerpc/platforms/cell/iommu.c | 6 +-
arch/powerpc/platforms/pasemi/iommu.c | 2 +-
arch/powerpc/platforms/pasemi/setup.c | 2 +-
arch/powerpc/platforms/powernv/npu-dma.c | 2 +-
arch/powerpc/platforms/ps3/system-bus.c | 8 +-
arch/powerpc/platforms/pseries/ibmebus.c | 4 +-
arch/powerpc/platforms/pseries/vio.c | 2 +-
arch/s390/Kconfig | 1 +
arch/s390/include/asm/device.h | 1 -
arch/s390/include/asm/dma-mapping.h | 6 +-
arch/s390/pci/pci.c | 2 +-
arch/s390/pci/pci_dma.c | 2 +-
arch/sh/include/asm/dma-mapping.h | 4 +-
arch/sh/kernel/dma-nommu.c | 2 +-
arch/sh/mm/consistent.c | 2 +-
arch/sparc/include/asm/dma-mapping.h | 10 +-
arch/sparc/kernel/iommu.c | 4 +-
arch/sparc/kernel/ioport.c | 8 +-
arch/sparc/kernel/pci_sun4v.c | 2 +-
arch/tile/include/asm/device.h | 3 -
arch/tile/include/asm/dma-mapping.h | 20 +-
arch/tile/kernel/pci-dma.c | 24 +-
arch/unicore32/include/asm/dma-mapping.h | 4 +-
arch/unicore32/mm/dma-swiotlb.c | 2 +-
arch/x86/include/asm/device.h | 5 +-
arch/x86/include/asm/dma-mapping.h | 11 +-
arch/x86/include/asm/iommu.h | 2 +-
arch/x86/kernel/amd_gart_64.c | 2 +-
arch/x86/kernel/pci-calgary_64.c | 6 +-
arch/x86/kernel/pci-dma.c | 4 +-
arch/x86/kernel/pci-nommu.c | 2 +-
arch/x86/kernel/pci-swiotlb.c | 2 +-
arch/x86/pci/common.c | 2 +-
arch/x86/pci/sta2x11-fixup.c | 10 +-
arch/x86/xen/pci-swiotlb-xen.c | 2 +-
arch/xtensa/include/asm/device.h | 4 -
arch/xtensa/include/asm/dma-mapping.h | 9 +-
arch/xtensa/kernel/pci-dma.c | 2 +-
drivers/infiniband/core/mad.c | 79 +++---
drivers/infiniband/core/rw.c | 30 +-
drivers/infiniband/core/umem.c | 13 +-
drivers/infiniband/core/umem_odp.c | 12 +-
drivers/infiniband/hw/hfi1/dma.c | 183 ------------
drivers/infiniband/hw/mlx4/cq.c | 8 +-
drivers/infiniband/hw/mlx4/mad.c | 79 +++---
drivers/infiniband/hw/mlx4/mr.c | 8 +-
drivers/infiniband/hw/mlx4/qp.c | 29 +-
drivers/infiniband/hw/mlx5/mr.c | 12 +-
drivers/infiniband/hw/qib/qib_dma.c | 169 -----------
drivers/infiniband/hw/qib/qib_keys.c | 5 +-
drivers/infiniband/sw/rdmavt/Kconfig | 1 +
drivers/infiniband/sw/rdmavt/Makefile | 2 +-
drivers/infiniband/sw/rdmavt/dma.c | 198 -------------
drivers/infiniband/sw/rdmavt/dma.h | 53 ----
drivers/infiniband/sw/rdmavt/mr.c | 8 +-
drivers/infiniband/sw/rdmavt/vt.c | 5 +-
drivers/infiniband/sw/rdmavt/vt.h | 1 -
drivers/infiniband/sw/rxe/Kconfig | 1 +
drivers/infiniband/sw/rxe/Makefile | 1 -
drivers/infiniband/sw/rxe/rxe_dma.c | 183 ------------
drivers/infiniband/sw/rxe/rxe_loc.h | 2 -
drivers/infiniband/sw/rxe/rxe_verbs.c | 3 +-
drivers/infiniband/ulp/ipoib/ipoib_cm.c | 34 ++-
drivers/infiniband/ulp/ipoib/ipoib_ib.c | 42 +--
drivers/infiniband/ulp/iser/iscsi_iser.c | 11 +-
drivers/infiniband/ulp/iser/iser_initiator.c | 88 +++---
drivers/infiniband/ulp/iser/iser_memory.c | 13 +-
drivers/infiniband/ulp/iser/iser_verbs.c | 6 +-
drivers/infiniband/ulp/isert/ib_isert.c | 120 ++++----
drivers/infiniband/ulp/srp/ib_srp.c | 80 +++---
drivers/infiniband/ulp/srpt/ib_srpt.c | 18 +-
drivers/iommu/amd_iommu.c | 10 +-
drivers/misc/mic/bus/mic_bus.c | 4 +-
drivers/misc/mic/bus/scif_bus.c | 4 +-
drivers/misc/mic/bus/scif_bus.h | 2 +-
drivers/misc/mic/bus/vop_bus.c | 2 +-
drivers/misc/mic/host/mic_boot.c | 4 +-
drivers/nvme/host/rdma.c | 35 +--
drivers/nvme/target/rdma.c | 32 +--
drivers/parisc/ccio-dma.c | 2 +-
drivers/parisc/sba_iommu.c | 2 +-
drivers/pci/host/vmd.c | 2 +-
.../staging/lustre/lnet/klnds/o2iblnd/o2iblnd.h | 14 +-
include/linux/device.h | 1 +
include/linux/dma-mapping.h | 55 ++--
include/linux/mic_bus.h | 2 +-
include/rdma/ib_verbs.h | 310 ---------------------
include/xen/arm/hypervisor.h | 2 +-
lib/Kconfig | 10 +
lib/Makefile | 3 +-
lib/dma-noop.c | 4 +-
lib/dma-virt.c | 73 +++++
net/9p/trans_rdma.c | 24 +-
net/rds/ib.h | 45 +--
net/rds/ib_cm.c | 42 +--
net/rds/ib_fmr.c | 10 +-
net/rds/ib_frmr.c | 12 +-
net/rds/ib_mr.h | 1 -
net/rds/ib_rdma.c | 13 +-
net/rds/ib_recv.c | 19 +-
net/rds/ib_send.c | 50 ++--
net/sunrpc/xprtrdma/fmr_ops.c | 12 +-
net/sunrpc/xprtrdma/frwr_ops.c | 12 +-
net/sunrpc/xprtrdma/rpc_rdma.c | 28 +-
net/sunrpc/xprtrdma/svc_rdma_backchannel.c | 7 +-
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 20 +-
net/sunrpc/xprtrdma/svc_rdma_sendto.c | 26 +-
net/sunrpc/xprtrdma/svc_rdma_transport.c | 17 +-
net/sunrpc/xprtrdma/verbs.c | 18 +-
179 files changed, 911 insertions(+), 2011 deletions(-)
delete mode 100644 drivers/infiniband/hw/hfi1/dma.c
delete mode 100644 drivers/infiniband/hw/qib/qib_dma.c
delete mode 100644 drivers/infiniband/sw/rdmavt/dma.c
delete mode 100644 drivers/infiniband/sw/rdmavt/dma.h
delete mode 100644 drivers/infiniband/sw/rxe/rxe_dma.c
create mode 100644 lib/dma-virt.c

--
2.11.0

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