GNU Linux-libre 4.9.287-gnu1
[releases.git] / drivers / infiniband / hw / usnic / usnic_debugfs.c
1 /*
2  * Copyright (c) 2013, Cisco Systems, 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  * 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
34 #include <linux/debugfs.h>
35 #include <linux/module.h>
36
37 #include "usnic.h"
38 #include "usnic_log.h"
39 #include "usnic_debugfs.h"
40 #include "usnic_ib_qp_grp.h"
41 #include "usnic_transport.h"
42
43 static struct dentry *debugfs_root;
44 static struct dentry *flows_dentry;
45
46 static ssize_t usnic_debugfs_buildinfo_read(struct file *f, char __user *data,
47                                                 size_t count, loff_t *ppos)
48 {
49         char buf[500];
50         int res;
51
52         if (*ppos > 0)
53                 return 0;
54
55         res = scnprintf(buf, sizeof(buf),
56                         "version:       %s\n"
57                         "build date:    %s\n",
58                         DRV_VERSION, DRV_RELDATE);
59
60         return simple_read_from_buffer(data, count, ppos, buf, res);
61 }
62
63 static const struct file_operations usnic_debugfs_buildinfo_ops = {
64         .owner = THIS_MODULE,
65         .open = simple_open,
66         .read = usnic_debugfs_buildinfo_read
67 };
68
69 static ssize_t flowinfo_read(struct file *f, char __user *data,
70                                 size_t count, loff_t *ppos)
71 {
72         struct usnic_ib_qp_grp_flow *qp_flow;
73         int n;
74         int left;
75         char *ptr;
76         char buf[512];
77
78         qp_flow = f->private_data;
79         ptr = buf;
80         left = count;
81
82         if (*ppos > 0)
83                 return 0;
84
85         spin_lock(&qp_flow->qp_grp->lock);
86         n = scnprintf(ptr, left,
87                         "QP Grp ID: %d Transport: %s ",
88                         qp_flow->qp_grp->grp_id,
89                         usnic_transport_to_str(qp_flow->trans_type));
90         UPDATE_PTR_LEFT(n, ptr, left);
91         if (qp_flow->trans_type == USNIC_TRANSPORT_ROCE_CUSTOM) {
92                 n = scnprintf(ptr, left, "Port_Num:%hu\n",
93                                         qp_flow->usnic_roce.port_num);
94                 UPDATE_PTR_LEFT(n, ptr, left);
95         } else if (qp_flow->trans_type == USNIC_TRANSPORT_IPV4_UDP) {
96                 n = usnic_transport_sock_to_str(ptr, left,
97                                 qp_flow->udp.sock);
98                 UPDATE_PTR_LEFT(n, ptr, left);
99                 n = scnprintf(ptr, left, "\n");
100                 UPDATE_PTR_LEFT(n, ptr, left);
101         }
102         spin_unlock(&qp_flow->qp_grp->lock);
103
104         return simple_read_from_buffer(data, count, ppos, buf, ptr - buf);
105 }
106
107 static const struct file_operations flowinfo_ops = {
108         .owner = THIS_MODULE,
109         .open = simple_open,
110         .read = flowinfo_read,
111 };
112
113 void usnic_debugfs_init(void)
114 {
115         debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
116         if (IS_ERR(debugfs_root)) {
117                 usnic_err("Failed to create debugfs root dir, check if debugfs is enabled in kernel configuration\n");
118                 goto out_clear_root;
119         }
120
121         flows_dentry = debugfs_create_dir("flows", debugfs_root);
122         if (IS_ERR_OR_NULL(flows_dentry)) {
123                 usnic_err("Failed to create debugfs flow dir with err %ld\n",
124                                 PTR_ERR(flows_dentry));
125                 goto out_free_root;
126         }
127
128         debugfs_create_file("build-info", S_IRUGO, debugfs_root,
129                                 NULL, &usnic_debugfs_buildinfo_ops);
130         return;
131
132 out_free_root:
133         debugfs_remove_recursive(debugfs_root);
134 out_clear_root:
135         debugfs_root = NULL;
136 }
137
138 void usnic_debugfs_exit(void)
139 {
140         if (!debugfs_root)
141                 return;
142
143         debugfs_remove_recursive(debugfs_root);
144         debugfs_root = NULL;
145 }
146
147 void usnic_debugfs_flow_add(struct usnic_ib_qp_grp_flow *qp_flow)
148 {
149         if (IS_ERR_OR_NULL(flows_dentry))
150                 return;
151
152         scnprintf(qp_flow->dentry_name, sizeof(qp_flow->dentry_name),
153                         "%u", qp_flow->flow->flow_id);
154         qp_flow->dbgfs_dentry = debugfs_create_file(qp_flow->dentry_name,
155                                                         S_IRUGO,
156                                                         flows_dentry,
157                                                         qp_flow,
158                                                         &flowinfo_ops);
159         if (IS_ERR_OR_NULL(qp_flow->dbgfs_dentry)) {
160                 usnic_err("Failed to create dbg fs entry for flow %u with error %ld\n",
161                                 qp_flow->flow->flow_id,
162                                 PTR_ERR(qp_flow->dbgfs_dentry));
163         }
164 }
165
166 void usnic_debugfs_flow_remove(struct usnic_ib_qp_grp_flow *qp_flow)
167 {
168         if (!IS_ERR_OR_NULL(qp_flow->dbgfs_dentry))
169                 debugfs_remove(qp_flow->dbgfs_dentry);
170 }