1 /*
2  * Copyright (c) 2013 - 2017 Intel Corporation.  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 #include <linux/debugfs.h>
33 #include <linux/seq_file.h>
34 #include <linux/kernel.h>
35 #include <linux/export.h>
36 
37 #include "qib.h"
38 #include "qib_verbs.h"
39 #include "qib_debugfs.h"
40 
41 static struct dentry *qib_dbg_root;
42 
43 #define DEBUGFS_FILE(name) \
44 static const struct seq_operations _##name##_seq_ops = { \
45 	.start = _##name##_seq_start, \
46 	.next  = _##name##_seq_next, \
47 	.stop  = _##name##_seq_stop, \
48 	.show  = _##name##_seq_show \
49 }; \
50 static int _##name##_open(struct inode *inode, struct file *s) \
51 { \
52 	struct seq_file *seq; \
53 	int ret; \
54 	ret =  seq_open(s, &_##name##_seq_ops); \
55 	if (ret) \
56 		return ret; \
57 	seq = s->private_data; \
58 	seq->private = inode->i_private; \
59 	return 0; \
60 } \
61 static const struct file_operations _##name##_file_ops = { \
62 	.owner   = THIS_MODULE, \
63 	.open    = _##name##_open, \
64 	.read    = seq_read, \
65 	.llseek  = seq_lseek, \
66 	.release = seq_release \
67 };
68 
69 static void *_opcode_stats_seq_start(struct seq_file *s, loff_t *pos)
70 {
71 	struct qib_opcode_stats_perctx *opstats;
72 
73 	if (*pos >= ARRAY_SIZE(opstats->stats))
74 		return NULL;
75 	return pos;
76 }
77 
78 static void *_opcode_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
79 {
80 	struct qib_opcode_stats_perctx *opstats;
81 
82 	++*pos;
83 	if (*pos >= ARRAY_SIZE(opstats->stats))
84 		return NULL;
85 	return pos;
86 }
87 
88 
89 static void _opcode_stats_seq_stop(struct seq_file *s, void *v)
90 {
91 	/* nothing allocated */
92 }
93 
94 static int _opcode_stats_seq_show(struct seq_file *s, void *v)
95 {
96 	loff_t *spos = v;
97 	loff_t i = *spos, j;
98 	u64 n_packets = 0, n_bytes = 0;
99 	struct qib_ibdev *ibd = (struct qib_ibdev *)s->private;
100 	struct qib_devdata *dd = dd_from_dev(ibd);
101 
102 	for (j = 0; j < dd->first_user_ctxt; j++) {
103 		if (!dd->rcd[j])
104 			continue;
105 		n_packets += dd->rcd[j]->opstats->stats[i].n_packets;
106 		n_bytes += dd->rcd[j]->opstats->stats[i].n_bytes;
107 	}
108 	if (!n_packets && !n_bytes)
109 		return SEQ_SKIP;
110 	seq_printf(s, "%02llx %llu/%llu\n", i,
111 		(unsigned long long) n_packets,
112 		(unsigned long long) n_bytes);
113 
114 	return 0;
115 }
116 
117 DEBUGFS_FILE(opcode_stats)
118 
119 static void *_ctx_stats_seq_start(struct seq_file *s, loff_t *pos)
120 {
121 	struct qib_ibdev *ibd = (struct qib_ibdev *)s->private;
122 	struct qib_devdata *dd = dd_from_dev(ibd);
123 
124 	if (!*pos)
125 		return SEQ_START_TOKEN;
126 	if (*pos >= dd->first_user_ctxt)
127 		return NULL;
128 	return pos;
129 }
130 
131 static void *_ctx_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
132 {
133 	struct qib_ibdev *ibd = (struct qib_ibdev *)s->private;
134 	struct qib_devdata *dd = dd_from_dev(ibd);
135 
136 	if (v == SEQ_START_TOKEN)
137 		return pos;
138 
139 	++*pos;
140 	if (*pos >= dd->first_user_ctxt)
141 		return NULL;
142 	return pos;
143 }
144 
145 static void _ctx_stats_seq_stop(struct seq_file *s, void *v)
146 {
147 	/* nothing allocated */
148 }
149 
150 static int _ctx_stats_seq_show(struct seq_file *s, void *v)
151 {
152 	loff_t *spos;
153 	loff_t i, j;
154 	u64 n_packets = 0;
155 	struct qib_ibdev *ibd = (struct qib_ibdev *)s->private;
156 	struct qib_devdata *dd = dd_from_dev(ibd);
157 
158 	if (v == SEQ_START_TOKEN) {
159 		seq_puts(s, "Ctx:npkts\n");
160 		return 0;
161 	}
162 
163 	spos = v;
164 	i = *spos;
165 
166 	if (!dd->rcd[i])
167 		return SEQ_SKIP;
168 
169 	for (j = 0; j < ARRAY_SIZE(dd->rcd[i]->opstats->stats); j++)
170 		n_packets += dd->rcd[i]->opstats->stats[j].n_packets;
171 
172 	if (!n_packets)
173 		return SEQ_SKIP;
174 
175 	seq_printf(s, "  %llu:%llu\n", i, n_packets);
176 	return 0;
177 }
178 
179 DEBUGFS_FILE(ctx_stats)
180 
181 static void *_qp_stats_seq_start(struct seq_file *s, loff_t *pos)
182 	__acquires(RCU)
183 {
184 	struct rvt_qp_iter *iter;
185 	loff_t n = *pos;
186 
187 	iter = rvt_qp_iter_init(s->private, 0, NULL);
188 
189 	/* stop calls rcu_read_unlock */
190 	rcu_read_lock();
191 
192 	if (!iter)
193 		return NULL;
194 
195 	do {
196 		if (rvt_qp_iter_next(iter)) {
197 			kfree(iter);
198 			return NULL;
199 		}
200 	} while (n--);
201 
202 	return iter;
203 }
204 
205 static void *_qp_stats_seq_next(struct seq_file *s, void *iter_ptr,
206 				   loff_t *pos)
207 	__must_hold(RCU)
208 {
209 	struct rvt_qp_iter *iter = iter_ptr;
210 
211 	(*pos)++;
212 
213 	if (rvt_qp_iter_next(iter)) {
214 		kfree(iter);
215 		return NULL;
216 	}
217 
218 	return iter;
219 }
220 
221 static void _qp_stats_seq_stop(struct seq_file *s, void *iter_ptr)
222 	__releases(RCU)
223 {
224 	rcu_read_unlock();
225 }
226 
227 static int _qp_stats_seq_show(struct seq_file *s, void *iter_ptr)
228 {
229 	struct rvt_qp_iter *iter = iter_ptr;
230 
231 	if (!iter)
232 		return 0;
233 
234 	qib_qp_iter_print(s, iter);
235 
236 	return 0;
237 }
238 
239 DEBUGFS_FILE(qp_stats)
240 
241 void qib_dbg_ibdev_init(struct qib_ibdev *ibd)
242 {
243 	struct dentry *root;
244 	char name[10];
245 
246 	snprintf(name, sizeof(name), "qib%d", dd_from_dev(ibd)->unit);
247 	root = debugfs_create_dir(name, qib_dbg_root);
248 	ibd->qib_ibdev_dbg = root;
249 
250 	debugfs_create_file("opcode_stats", 0400, root, ibd,
251 			    &_opcode_stats_file_ops);
252 	debugfs_create_file("ctx_stats", 0400, root, ibd, &_ctx_stats_file_ops);
253 	debugfs_create_file("qp_stats", 0400, root, ibd, &_qp_stats_file_ops);
254 }
255 
256 void qib_dbg_ibdev_exit(struct qib_ibdev *ibd)
257 {
258 	if (!qib_dbg_root)
259 		goto out;
260 	debugfs_remove_recursive(ibd->qib_ibdev_dbg);
261 out:
262 	ibd->qib_ibdev_dbg = NULL;
263 }
264 
265 void qib_dbg_init(void)
266 {
267 	qib_dbg_root = debugfs_create_dir(QIB_DRV_NAME, NULL);
268 }
269 
270 void qib_dbg_exit(void)
271 {
272 	debugfs_remove_recursive(qib_dbg_root);
273 	qib_dbg_root = NULL;
274 }
275