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RDMA/umem: Use umem->owning_mm inside ODP

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Since ODP had a single struct mmu_notifier located in the ucontext it
could only handle a single MM at a time, and this prevented it from using
the new owning_mm system.

With the prior rework it is now simple to let ODP track multiple MMs per
ucontext, finish the job so that the per_mm is allocated on a mm by mm
basis, and freed when the last umem is dropped from the ucontext.

As a side effect the new saner locking removes the lockdep splat about
nesting the umem_rwsem between mmu_notifier_unregister and
ib_umem_odp_release.

It also makes ODP work with multiple processes, across, fork, etc.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Jason Gunthorpe
2018-09-16 20:48:08 +03:00
committed by Doug Ledford
parent c9990ab39b
commit f27a0d50a4
6 changed files with 191 additions and 169 deletions
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2
drivers/infiniband/hw/mlx5/odp.c
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@@ -393,7 +393,7 @@ next_mr:
if (nentries)
nentries++;
} else {
odp = ib_alloc_odp_umem(odp_mr->umem.context, addr,
odp = ib_alloc_odp_umem(odp_mr->per_mm, addr,
MLX5_IMR_MTT_SIZE);
if (IS_ERR(odp)) {
mutex_unlock(&odp_mr->umem_mutex);