diff options
| author | Jason Gunthorpe <jgg@mellanox.com> | 2020-01-08 19:21:53 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2020-01-13 16:17:19 -0400 |
| commit | 6898d1c661d79f4707d8ba82991b2195822780ca (patch) | |
| tree | 9a9beb1ffb18967ab7bf320d686d7705fa1004f7 /include/rdma | |
| parent | 8bdf9dd984c18375d1090ddeb1792511f619c5c1 (diff) | |
RDMA/mlx5: Use RCU and direct refcounts to keep memory alive
dispatch_event_fd() runs from a notifier with minimal locking, and relies
on RCU and a file refcount to keep the uobject and eventfd alive.
As the next patch wants to remove the file_operations release function
from the drivers, re-organize things so that the devx_event_notifier()
path uses the existing RCU to manage the lifetime of the uobject and
eventfd.
Move the refcount puts to a call_rcu so that the objects are guaranteed to
exist and remove the indirect file refcount.
Link: https://lore.kernel.org/r/1578504126-9400-2-git-send-email-yishaih@mellanox.com
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include/rdma')
| -rw-r--r-- | include/rdma/uverbs_types.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/rdma/uverbs_types.h b/include/rdma/uverbs_types.h index 0b0f5a5f392d..ca65d4704b4b 100644 --- a/include/rdma/uverbs_types.h +++ b/include/rdma/uverbs_types.h @@ -144,6 +144,18 @@ void rdma_alloc_abort_uobject(struct ib_uobject *uobj, int __must_check rdma_alloc_commit_uobject(struct ib_uobject *uobj, struct uverbs_attr_bundle *attrs); +/* + * 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. + */ +static inline void uverbs_uobject_get(struct ib_uobject *uobject) +{ + kref_get(&uobject->ref); +} +void uverbs_uobject_put(struct ib_uobject *uobject); + struct uverbs_obj_fd_type { /* * In fd based objects, uverbs_obj_type_ops points to generic |