GNU Linux-libre 4.19.264-gnu1
[releases.git] / drivers / infiniband / core / uverbs_std_types_dm.c
1 /*
2  * Copyright (c) 2018, Mellanox Technologies inc.  All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32
33 #include "uverbs.h"
34 #include <rdma/uverbs_std_types.h>
35
36 static int uverbs_free_dm(struct ib_uobject *uobject,
37                           enum rdma_remove_reason why)
38 {
39         struct ib_dm *dm = uobject->object;
40         int ret;
41
42         ret = ib_destroy_usecnt(&dm->usecnt, why, uobject);
43         if (ret)
44                 return ret;
45
46         return dm->device->dealloc_dm(dm);
47 }
48
49 static int
50 UVERBS_HANDLER(UVERBS_METHOD_DM_ALLOC)(struct ib_uverbs_file *file,
51                                        struct uverbs_attr_bundle *attrs)
52 {
53         struct ib_dm_alloc_attr attr = {};
54         struct ib_uobject *uobj =
55                 uverbs_attr_get(attrs, UVERBS_ATTR_ALLOC_DM_HANDLE)
56                         ->obj_attr.uobject;
57         struct ib_device *ib_dev = uobj->context->device;
58         struct ib_dm *dm;
59         int ret;
60
61         if (!ib_dev->alloc_dm)
62                 return -EOPNOTSUPP;
63
64         ret = uverbs_copy_from(&attr.length, attrs,
65                                UVERBS_ATTR_ALLOC_DM_LENGTH);
66         if (ret)
67                 return ret;
68
69         ret = uverbs_copy_from(&attr.alignment, attrs,
70                                UVERBS_ATTR_ALLOC_DM_ALIGNMENT);
71         if (ret)
72                 return ret;
73
74         dm = ib_dev->alloc_dm(ib_dev, uobj->context, &attr, attrs);
75         if (IS_ERR(dm))
76                 return PTR_ERR(dm);
77
78         dm->device  = ib_dev;
79         dm->length  = attr.length;
80         dm->uobject = uobj;
81         atomic_set(&dm->usecnt, 0);
82
83         uobj->object = dm;
84
85         return 0;
86 }
87
88 DECLARE_UVERBS_NAMED_METHOD(
89         UVERBS_METHOD_DM_ALLOC,
90         UVERBS_ATTR_IDR(UVERBS_ATTR_ALLOC_DM_HANDLE,
91                         UVERBS_OBJECT_DM,
92                         UVERBS_ACCESS_NEW,
93                         UA_MANDATORY),
94         UVERBS_ATTR_PTR_IN(UVERBS_ATTR_ALLOC_DM_LENGTH,
95                            UVERBS_ATTR_TYPE(u64),
96                            UA_MANDATORY),
97         UVERBS_ATTR_PTR_IN(UVERBS_ATTR_ALLOC_DM_ALIGNMENT,
98                            UVERBS_ATTR_TYPE(u32),
99                            UA_MANDATORY));
100
101 DECLARE_UVERBS_NAMED_METHOD_DESTROY(
102         UVERBS_METHOD_DM_FREE,
103         UVERBS_ATTR_IDR(UVERBS_ATTR_FREE_DM_HANDLE,
104                         UVERBS_OBJECT_DM,
105                         UVERBS_ACCESS_DESTROY,
106                         UA_MANDATORY));
107
108 DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_DM,
109                             UVERBS_TYPE_ALLOC_IDR(uverbs_free_dm),
110                             &UVERBS_METHOD(UVERBS_METHOD_DM_ALLOC),
111                             &UVERBS_METHOD(UVERBS_METHOD_DM_FREE));