1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2/*
3 * Copyright (c) 2019, Mellanox Technologies inc. All rights reserved.
4 */
5
6#include <rdma/uverbs_std_types.h>
7#include <rdma/uverbs_ioctl.h>
8#include "rdma_core.h"
9#include "uverbs.h"
10
11static int UVERBS_HANDLER(UVERBS_METHOD_ASYNC_EVENT_ALLOC)(
12 struct uverbs_attr_bundle *attrs)
13{
14 struct ib_uobject *uobj =
15 uverbs_attr_get_uobject(attrs_bundle: attrs, idx: UVERBS_METHOD_ASYNC_EVENT_ALLOC);
16
17 ib_uverbs_init_async_event_file(
18 container_of(uobj, struct ib_uverbs_async_event_file, uobj));
19 return 0;
20}
21
22static void uverbs_async_event_destroy_uobj(struct ib_uobject *uobj,
23 enum rdma_remove_reason why)
24{
25 struct ib_uverbs_async_event_file *event_file =
26 container_of(uobj, struct ib_uverbs_async_event_file, uobj);
27
28 ib_unregister_event_handler(event_handler: &event_file->event_handler);
29
30 if (why == RDMA_REMOVE_DRIVER_REMOVE)
31 ib_uverbs_async_handler(async_file: event_file, element: 0, event: IB_EVENT_DEVICE_FATAL,
32 NULL, NULL);
33}
34
35int uverbs_async_event_release(struct inode *inode, struct file *filp)
36{
37 struct ib_uverbs_async_event_file *event_file;
38 struct ib_uobject *uobj = filp->private_data;
39 int ret;
40
41 if (!uobj)
42 return uverbs_uobject_fd_release(inode, filp);
43
44 event_file =
45 container_of(uobj, struct ib_uverbs_async_event_file, uobj);
46
47 /*
48 * The async event FD has to deliver IB_EVENT_DEVICE_FATAL even after
49 * disassociation, so cleaning the event list must only happen after
50 * release. The user knows it has reached the end of the event stream
51 * when it sees IB_EVENT_DEVICE_FATAL.
52 */
53 uverbs_uobject_get(uobject: uobj);
54 ret = uverbs_uobject_fd_release(inode, filp);
55 ib_uverbs_free_event_queue(event_queue: &event_file->ev_queue);
56 uverbs_uobject_put(uobject: uobj);
57 return ret;
58}
59
60DECLARE_UVERBS_NAMED_METHOD(
61 UVERBS_METHOD_ASYNC_EVENT_ALLOC,
62 UVERBS_ATTR_FD(UVERBS_ATTR_ASYNC_EVENT_ALLOC_FD_HANDLE,
63 UVERBS_OBJECT_ASYNC_EVENT,
64 UVERBS_ACCESS_NEW,
65 UA_MANDATORY));
66
67DECLARE_UVERBS_NAMED_OBJECT(
68 UVERBS_OBJECT_ASYNC_EVENT,
69 UVERBS_TYPE_ALLOC_FD(sizeof(struct ib_uverbs_async_event_file),
70 uverbs_async_event_destroy_uobj,
71 &uverbs_async_event_fops,
72 "[infinibandevent]",
73 O_RDONLY),
74 &UVERBS_METHOD(UVERBS_METHOD_ASYNC_EVENT_ALLOC));
75
76const struct uapi_definition uverbs_def_obj_async_fd[] = {
77 UAPI_DEF_CHAIN_OBJ_TREE_NAMED(UVERBS_OBJECT_ASYNC_EVENT),
78 {}
79};
80

source code of linux/drivers/infiniband/core/uverbs_std_types_async_fd.c