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| author |   Matan Barak <matanb@mellanox.com> | 2017-04-04 13:31:44 +0300 |
|---|---|---|
| committer |   Doug Ledford <dledford@redhat.com> | 2017-04-05 13:28:04 -0400 |
| commit | fd3c7904db6e05043398aee5c1448682acfb025b (patch) | |
| tree | c394cf76ca93e0a5a637cd268073ab91590483fd /drivers/infiniband/core/rdma_core.h | |
| parent | IB/core: Add idr based standard types (diff) | |
| download | linux-dev-fd3c7904db6e05043398aee5c1448682acfb025b.tar.xz linux-dev-fd3c7904db6e05043398aee5c1448682acfb025b.zip | |
IB/core: Change idr objects to use the new schema
This changes only the handlers which deals with idr based objects to
use the new idr allocation, fetching and destruction schema.
This patch consists of the following changes:
(1) Allocation, fetching and destruction is done via idr ops.
(2) Context initializing and release is done through
uverbs_initialize_ucontext and uverbs_cleanup_ucontext.
(3) Ditching the live flag. Mostly, this is pretty straight
forward. The only place that is a bit trickier is in
ib_uverbs_open_qp. Commit [1] added code to check whether
the uobject is already live and initialized. This mostly
happens because of a race between open_qp and events.
We delayed assigning the uobject's pointer in order to
eliminate this race without using the live variable.
[1] commit a040f95dc819
("IB/core: Fix XRC race condition in ib_uverbs_open_qp")
Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/core/rdma_core.h')
| -rw-r--r-- | drivers/infiniband/core/rdma_core.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/infiniband/core/rdma_core.h b/drivers/infiniband/core/rdma_core.h index ab665a6088ac..0247bb5e3dd3 100644 --- a/drivers/infiniband/core/rdma_core.h +++ b/drivers/infiniband/core/rdma_core.h @@ -52,4 +52,19 @@ void uverbs_cleanup_ucontext(struct ib_ucontext *ucontext, bool device_removed); void uverbs_initialize_ucontext(struct ib_ucontext *ucontext); +/* + * uverbs_uobject_get is called in order to increase the reference count on + * an uobject. This is useful when a handler wants to keep the uobject's memory + * alive, regardless if this uobject is still alive in the context's objects + * repository. Objects are put via uverbs_uobject_put. + */ +void uverbs_uobject_get(struct ib_uobject *uobject); + +/* + * In order to indicate we no longer needs this uobject, uverbs_uobject_put + * is called. When the reference count is decreased, the uobject is freed. + * For example, this is used when attaching a completion channel to a CQ. + */ +void uverbs_uobject_put(struct ib_uobject *uobject); + #endif /* RDMA_CORE_H */ |