f7c6a7b5d5
Export ib_umem_get()/ib_umem_release() and put low-level drivers in
control of when to call ib_umem_get() to pin and DMA map userspace,
rather than always calling it in ib_uverbs_reg_mr() before calling the
low-level driver's reg_user_mr method.
Also move these functions to be in the ib_core module instead of
ib_uverbs, so that driver modules using them do not depend on
ib_uverbs.
This has a number of advantages:
- It is better design from the standpoint of making generic code a
library that can be used or overridden by device-specific code as
the details of specific devices dictate.
- Drivers that do not need to pin userspace memory regions do not
need to take the performance hit of calling ib_mem_get(). For
example, although I have not tried to implement it in this patch,
the ipath driver should be able to avoid pinning memory and just
use copy_{to,from}_user() to access userspace memory regions.
- Buffers that need special mapping treatment can be identified by
the low-level driver. For example, it may be possible to solve
some Altix-specific memory ordering issues with mthca CQs in
userspace by mapping CQ buffers with extra flags.
- Drivers that need to pin and DMA map userspace memory for things
other than memory regions can use ib_umem_get() directly, instead
of hacks using extra parameters to their reg_phys_mr method. For
example, the mlx4 driver that is pending being merged needs to pin
and DMA map QP and CQ buffers, but it does not need to create a
memory key for these buffers. So the cleanest solution is for mlx4
to call ib_umem_get() in the create_qp and create_cq methods.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
32 lines
790 B
Makefile
32 lines
790 B
Makefile
infiniband-$(CONFIG_INFINIBAND_ADDR_TRANS) := ib_addr.o rdma_cm.o
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user_access-$(CONFIG_INFINIBAND_ADDR_TRANS) := rdma_ucm.o
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obj-$(CONFIG_INFINIBAND) += ib_core.o ib_mad.o ib_sa.o \
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ib_cm.o iw_cm.o $(infiniband-y)
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obj-$(CONFIG_INFINIBAND_USER_MAD) += ib_umad.o
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obj-$(CONFIG_INFINIBAND_USER_ACCESS) += ib_uverbs.o ib_ucm.o \
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$(user_access-y)
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ib_core-y := packer.o ud_header.o verbs.o sysfs.o \
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device.o fmr_pool.o cache.o
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ib_core-$(CONFIG_INFINIBAND_USER_MEM) += umem.o
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ib_mad-y := mad.o smi.o agent.o mad_rmpp.o
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ib_sa-y := sa_query.o multicast.o
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ib_cm-y := cm.o
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iw_cm-y := iwcm.o
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rdma_cm-y := cma.o
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rdma_ucm-y := ucma.o
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ib_addr-y := addr.o
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ib_umad-y := user_mad.o
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ib_ucm-y := ucm.o
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ib_uverbs-y := uverbs_main.o uverbs_cmd.o uverbs_marshall.o
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