Merge branch 'regmap-5.1' into regmap-linus
[sfrench/cifs-2.6.git] / include / rdma / restrack.h
1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
2 /*
3  * Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved.
4  */
5
6 #ifndef _RDMA_RESTRACK_H_
7 #define _RDMA_RESTRACK_H_
8
9 #include <linux/typecheck.h>
10 #include <linux/sched.h>
11 #include <linux/kref.h>
12 #include <linux/completion.h>
13 #include <linux/sched/task.h>
14 #include <uapi/rdma/rdma_netlink.h>
15 #include <linux/xarray.h>
16
17 /**
18  * enum rdma_restrack_type - HW objects to track
19  */
20 enum rdma_restrack_type {
21         /**
22          * @RDMA_RESTRACK_PD: Protection domain (PD)
23          */
24         RDMA_RESTRACK_PD,
25         /**
26          * @RDMA_RESTRACK_CQ: Completion queue (CQ)
27          */
28         RDMA_RESTRACK_CQ,
29         /**
30          * @RDMA_RESTRACK_QP: Queue pair (QP)
31          */
32         RDMA_RESTRACK_QP,
33         /**
34          * @RDMA_RESTRACK_CM_ID: Connection Manager ID (CM_ID)
35          */
36         RDMA_RESTRACK_CM_ID,
37         /**
38          * @RDMA_RESTRACK_MR: Memory Region (MR)
39          */
40         RDMA_RESTRACK_MR,
41         /**
42          * @RDMA_RESTRACK_CTX: Verbs contexts (CTX)
43          */
44         RDMA_RESTRACK_CTX,
45         /**
46          * @RDMA_RESTRACK_MAX: Last entry, used for array dclarations
47          */
48         RDMA_RESTRACK_MAX
49 };
50
51 struct ib_device;
52
53 /**
54  * struct rdma_restrack_entry - metadata per-entry
55  */
56 struct rdma_restrack_entry {
57         /**
58          * @valid: validity indicator
59          *
60          * The entries are filled during rdma_restrack_add,
61          * can be attempted to be free during rdma_restrack_del.
62          *
63          * As an example for that, see mlx5 QPs with type MLX5_IB_QPT_HW_GSI
64          */
65         bool                    valid;
66         /*
67          * @kref: Protect destroy of the resource
68          */
69         struct kref             kref;
70         /*
71          * @comp: Signal that all consumers of resource are completed their work
72          */
73         struct completion       comp;
74         /**
75          * @task: owner of resource tracking entity
76          *
77          * There are two types of entities: created by user and created
78          * by kernel.
79          *
80          * This is relevant for the entities created by users.
81          * For the entities created by kernel, this pointer will be NULL.
82          */
83         struct task_struct      *task;
84         /**
85          * @kern_name: name of owner for the kernel created entities.
86          */
87         const char              *kern_name;
88         /**
89          * @type: various objects in restrack database
90          */
91         enum rdma_restrack_type type;
92         /**
93          * @user: user resource
94          */
95         bool                    user;
96         /**
97          * @id: ID to expose to users
98          */
99         u32 id;
100 };
101
102 int rdma_restrack_count(struct ib_device *dev,
103                         enum rdma_restrack_type type,
104                         struct pid_namespace *ns);
105
106 void rdma_restrack_kadd(struct rdma_restrack_entry *res);
107 void rdma_restrack_uadd(struct rdma_restrack_entry *res);
108
109 /**
110  * rdma_restrack_del() - delete object from the reource tracking database
111  * @res:  resource entry
112  * @type: actual type of object to operate
113  */
114 void rdma_restrack_del(struct rdma_restrack_entry *res);
115
116 /**
117  * rdma_is_kernel_res() - check the owner of resource
118  * @res:  resource entry
119  */
120 static inline bool rdma_is_kernel_res(struct rdma_restrack_entry *res)
121 {
122         return !res->user;
123 }
124
125 /**
126  * rdma_restrack_get() - grab to protect resource from release
127  * @res:  resource entry
128  */
129 int __must_check rdma_restrack_get(struct rdma_restrack_entry *res);
130
131 /**
132  * rdma_restrack_put() - release resource
133  * @res:  resource entry
134  */
135 int rdma_restrack_put(struct rdma_restrack_entry *res);
136
137 /**
138  * rdma_restrack_set_task() - set the task for this resource
139  * @res:  resource entry
140  * @caller: kernel name, the current task will be used if the caller is NULL.
141  */
142 void rdma_restrack_set_task(struct rdma_restrack_entry *res,
143                             const char *caller);
144
145 /*
146  * Helper functions for rdma drivers when filling out
147  * nldev driver attributes.
148  */
149 int rdma_nl_put_driver_u32(struct sk_buff *msg, const char *name, u32 value);
150 int rdma_nl_put_driver_u32_hex(struct sk_buff *msg, const char *name,
151                                u32 value);
152 int rdma_nl_put_driver_u64(struct sk_buff *msg, const char *name, u64 value);
153 int rdma_nl_put_driver_u64_hex(struct sk_buff *msg, const char *name,
154                                u64 value);
155 struct rdma_restrack_entry *rdma_restrack_get_byid(struct ib_device *dev,
156                                                    enum rdma_restrack_type type,
157                                                    u32 id);
158 #endif /* _RDMA_RESTRACK_H_ */