1 #ifdef CONFIG_DEBUG_FS
2 /*
3  * Copyright (c) 2013 Intel Corporation.  All rights reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *      - Redistributions of source code must retain the above
16  *        copyright notice, this list of conditions and the following
17  *        disclaimer.
18  *
19  *      - Redistributions in binary form must reproduce the above
20  *        copyright notice, this list of conditions and the following
21  *        disclaimer in the documentation and/or other materials
22  *        provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  */
33 #include <linux/debugfs.h>
34 #include <linux/seq_file.h>
35 #include <linux/kernel.h>
36 #include <linux/export.h>
37 
38 #include "qib.h"
39 #include "qib_verbs.h"
40 #include "qib_debugfs.h"
41 
42 static struct dentry *qib_dbg_root;
43 
44 #define DEBUGFS_FILE(name) \
45 static const struct seq_operations _##name##_seq_ops = { \
46 	.start = _##name##_seq_start, \
47 	.next  = _##name##_seq_next, \
48 	.stop  = _##name##_seq_stop, \
49 	.show  = _##name##_seq_show \
50 }; \
51 static int _##name##_open(struct inode *inode, struct file *s) \
52 { \
53 	struct seq_file *seq; \
54 	int ret; \
55 	ret =  seq_open(s, &_##name##_seq_ops); \
56 	if (ret) \
57 		return ret; \
58 	seq = s->private_data; \
59 	seq->private = inode->i_private; \
60 	return 0; \
61 } \
62 static const struct file_operations _##name##_file_ops = { \
63 	.owner   = THIS_MODULE, \
64 	.open    = _##name##_open, \
65 	.read    = seq_read, \
66 	.llseek  = seq_lseek, \
67 	.release = seq_release \
68 };
69 
70 #define DEBUGFS_FILE_CREATE(name) \
71 do { \
72 	struct dentry *ent; \
73 	ent = debugfs_create_file(#name , 0400, ibd->qib_ibdev_dbg, \
74 		ibd, &_##name##_file_ops); \
75 	if (!ent) \
76 		pr_warn("create of " #name " failed\n"); \
77 } while (0)
78 
79 static void *_opcode_stats_seq_start(struct seq_file *s, loff_t *pos)
80 {
81 	struct qib_opcode_stats_perctx *opstats;
82 
83 	if (*pos >= ARRAY_SIZE(opstats->stats))
84 		return NULL;
85 	return pos;
86 }
87 
88 static void *_opcode_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
89 {
90 	struct qib_opcode_stats_perctx *opstats;
91 
92 	++*pos;
93 	if (*pos >= ARRAY_SIZE(opstats->stats))
94 		return NULL;
95 	return pos;
96 }
97 
98 
99 static void _opcode_stats_seq_stop(struct seq_file *s, void *v)
100 {
101 	/* nothing allocated */
102 }
103 
104 static int _opcode_stats_seq_show(struct seq_file *s, void *v)
105 {
106 	loff_t *spos = v;
107 	loff_t i = *spos, j;
108 	u64 n_packets = 0, n_bytes = 0;
109 	struct qib_ibdev *ibd = (struct qib_ibdev *)s->private;
110 	struct qib_devdata *dd = dd_from_dev(ibd);
111 
112 	for (j = 0; j < dd->first_user_ctxt; j++) {
113 		if (!dd->rcd[j])
114 			continue;
115 		n_packets += dd->rcd[j]->opstats->stats[i].n_packets;
116 		n_bytes += dd->rcd[j]->opstats->stats[i].n_bytes;
117 	}
118 	if (!n_packets && !n_bytes)
119 		return SEQ_SKIP;
120 	seq_printf(s, "%02llx %llu/%llu\n", i,
121 		(unsigned long long) n_packets,
122 		(unsigned long long) n_bytes);
123 
124 	return 0;
125 }
126 
127 DEBUGFS_FILE(opcode_stats)
128 
129 static void *_ctx_stats_seq_start(struct seq_file *s, loff_t *pos)
130 {
131 	struct qib_ibdev *ibd = (struct qib_ibdev *)s->private;
132 	struct qib_devdata *dd = dd_from_dev(ibd);
133 
134 	if (!*pos)
135 		return SEQ_START_TOKEN;
136 	if (*pos >= dd->first_user_ctxt)
137 		return NULL;
138 	return pos;
139 }
140 
141 static void *_ctx_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
142 {
143 	struct qib_ibdev *ibd = (struct qib_ibdev *)s->private;
144 	struct qib_devdata *dd = dd_from_dev(ibd);
145 
146 	if (v == SEQ_START_TOKEN)
147 		return pos;
148 
149 	++*pos;
150 	if (*pos >= dd->first_user_ctxt)
151 		return NULL;
152 	return pos;
153 }
154 
155 static void _ctx_stats_seq_stop(struct seq_file *s, void *v)
156 {
157 	/* nothing allocated */
158 }
159 
160 static int _ctx_stats_seq_show(struct seq_file *s, void *v)
161 {
162 	loff_t *spos;
163 	loff_t i, j;
164 	u64 n_packets = 0;
165 	struct qib_ibdev *ibd = (struct qib_ibdev *)s->private;
166 	struct qib_devdata *dd = dd_from_dev(ibd);
167 
168 	if (v == SEQ_START_TOKEN) {
169 		seq_puts(s, "Ctx:npkts\n");
170 		return 0;
171 	}
172 
173 	spos = v;
174 	i = *spos;
175 
176 	if (!dd->rcd[i])
177 		return SEQ_SKIP;
178 
179 	for (j = 0; j < ARRAY_SIZE(dd->rcd[i]->opstats->stats); j++)
180 		n_packets += dd->rcd[i]->opstats->stats[j].n_packets;
181 
182 	if (!n_packets)
183 		return SEQ_SKIP;
184 
185 	seq_printf(s, "  %llu:%llu\n", i, n_packets);
186 	return 0;
187 }
188 
189 DEBUGFS_FILE(ctx_stats)
190 
191 static void *_qp_stats_seq_start(struct seq_file *s, loff_t *pos)
192 	__acquires(RCU)
193 {
194 	struct qib_qp_iter *iter;
195 	loff_t n = *pos;
196 
197 	iter = qib_qp_iter_init(s->private);
198 
199 	/* stop calls rcu_read_unlock */
200 	rcu_read_lock();
201 
202 	if (!iter)
203 		return NULL;
204 
205 	do {
206 		if (qib_qp_iter_next(iter)) {
207 			kfree(iter);
208 			return NULL;
209 		}
210 	} while (n--);
211 
212 	return iter;
213 }
214 
215 static void *_qp_stats_seq_next(struct seq_file *s, void *iter_ptr,
216 				   loff_t *pos)
217 	__must_hold(RCU)
218 {
219 	struct qib_qp_iter *iter = iter_ptr;
220 
221 	(*pos)++;
222 
223 	if (qib_qp_iter_next(iter)) {
224 		kfree(iter);
225 		return NULL;
226 	}
227 
228 	return iter;
229 }
230 
231 static void _qp_stats_seq_stop(struct seq_file *s, void *iter_ptr)
232 	__releases(RCU)
233 {
234 	rcu_read_unlock();
235 }
236 
237 static int _qp_stats_seq_show(struct seq_file *s, void *iter_ptr)
238 {
239 	struct qib_qp_iter *iter = iter_ptr;
240 
241 	if (!iter)
242 		return 0;
243 
244 	qib_qp_iter_print(s, iter);
245 
246 	return 0;
247 }
248 
249 DEBUGFS_FILE(qp_stats)
250 
251 void qib_dbg_ibdev_init(struct qib_ibdev *ibd)
252 {
253 	char name[10];
254 
255 	snprintf(name, sizeof(name), "qib%d", dd_from_dev(ibd)->unit);
256 	ibd->qib_ibdev_dbg = debugfs_create_dir(name, qib_dbg_root);
257 	if (!ibd->qib_ibdev_dbg) {
258 		pr_warn("create of %s failed\n", name);
259 		return;
260 	}
261 	DEBUGFS_FILE_CREATE(opcode_stats);
262 	DEBUGFS_FILE_CREATE(ctx_stats);
263 	DEBUGFS_FILE_CREATE(qp_stats);
264 }
265 
266 void qib_dbg_ibdev_exit(struct qib_ibdev *ibd)
267 {
268 	if (!qib_dbg_root)
269 		goto out;
270 	debugfs_remove_recursive(ibd->qib_ibdev_dbg);
271 out:
272 	ibd->qib_ibdev_dbg = NULL;
273 }
274 
275 void qib_dbg_init(void)
276 {
277 	qib_dbg_root = debugfs_create_dir(QIB_DRV_NAME, NULL);
278 	if (!qib_dbg_root)
279 		pr_warn("init of debugfs failed\n");
280 }
281 
282 void qib_dbg_exit(void)
283 {
284 	debugfs_remove_recursive(qib_dbg_root);
285 	qib_dbg_root = NULL;
286 }
287 
288 #endif
289 
290