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RDMA/mlx5: Rework implicit ODP destroy

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Use SRCU in a sensible way by removing all MRs in the implicit tree from
the two xarrays (the update operation), then a synchronize, followed by a
normal single threaded teardown.

This is only a little unusual from the normal pattern as there can still
be some work pending in the unbound wq that may also require a workqueue
flush. This is tracked with a single atomic, consolidating the redundant
existing atomics and wait queue.

For understand-ability the entire ODP implicit create/destroy flow now
largely exists in a single pair of functions within odp.c, with a few
support functions for tearing down an unused child.

Link: https://lore.kernel.org/r/20191009160934.3143-13-jgg@ziepe.ca
Reviewed-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2019-10-09 13:09:32 -03:00
parent b70d785d23
commit 5256edcb98
5 changed files with 124 additions and 70 deletions
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2
include/rdma/ib_umem_odp.h
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@ -78,9 +78,7 @@ struct ib_umem_odp {
bool is_implicit_odp;
struct completion notifier_completion;
int dying;
unsigned int page_shift;
struct work_struct work;
};
static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)