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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb 
 kernel/drivers/misc/mei/debugfs.c
....@@ -1,22 +1,14 @@
1
+// SPDX-License-Identifier: GPL-2.0
12 /*
2
- *
3
+ * Copyright (c) 2012-2016, Intel Corporation. All rights reserved
34  * Intel Management Engine Interface (Intel MEI) Linux driver
4
- * Copyright (c) 2012-2013, Intel Corporation.
5
- *
6
- * This program is free software; you can redistribute it and/or modify it
7
- * under the terms and conditions of the GNU General Public License,
8
- * version 2, as published by the Free Software Foundation.
9
- *
10
- * This program is distributed in the hope it will be useful, but WITHOUT
11
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13
- * more details.
14
- *
155  */
6
+
167 #include <linux/slab.h>
178 #include <linux/kernel.h>
189 #include <linux/device.h>
1910 #include <linux/debugfs.h>
11
+#include <linux/seq_file.h>
2012 
2113 #include <linux/mei.h>
2214 
....@@ -24,104 +16,57 @@
2416 #include "client.h"
2517 #include "hw.h"
2618 
27
-static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
28
-					size_t cnt, loff_t *ppos)
19
+static int mei_dbgfs_meclients_show(struct seq_file *m, void *unused)
2920 {
30
-	struct mei_device *dev = fp->private_data;
21
+	struct mei_device *dev = m->private;
3122 	struct mei_me_client *me_cl;
32
-	size_t bufsz = 1;
33
-	char *buf;
3423 	int i = 0;
35
-	int pos = 0;
36
-	int ret;
3724 
38
-#define HDR \
39
-"  |id|fix|         UUID                       |con|msg len|sb|refc|\n"
25
+	if (!dev)
26
+		return -ENODEV;
4027 
4128 	down_read(&dev->me_clients_rwsem);
42
-	list_for_each_entry(me_cl, &dev->me_clients, list)
43
-		bufsz++;
4429 
45
-	bufsz *= sizeof(HDR) + 1;
46
-	buf = kzalloc(bufsz, GFP_KERNEL);
47
-	if (!buf) {
48
-		up_read(&dev->me_clients_rwsem);
49
-		return -ENOMEM;
50
-	}
51
-
52
-	pos += scnprintf(buf + pos, bufsz - pos, HDR);
53
-#undef HDR
30
+	seq_puts(m, "  |id|fix|         UUID                       |con|msg len|sb|refc|vt|\n");
5431 
5532 	/*  if the driver is not enabled the list won't be consistent */
5633 	if (dev->dev_state != MEI_DEV_ENABLED)
5734 		goto out;
5835 
5936 	list_for_each_entry(me_cl, &dev->me_clients, list) {
37
+		if (!mei_me_cl_get(me_cl))
38
+			continue;
6039 
61
-		if (mei_me_cl_get(me_cl)) {
62
-			pos += scnprintf(buf + pos, bufsz - pos,
63
-				"%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n",
64
-				i++, me_cl->client_id,
65
-				me_cl->props.fixed_address,
66
-				&me_cl->props.protocol_name,
67
-				me_cl->props.max_number_of_connections,
68
-				me_cl->props.max_msg_length,
69
-				me_cl->props.single_recv_buf,
70
-				kref_read(&me_cl->refcnt));
71
-
72
-			mei_me_cl_put(me_cl);
73
-		}
40
+		seq_printf(m, "%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|%2d|\n",
41
+			   i++, me_cl->client_id,
42
+			   me_cl->props.fixed_address,
43
+			   &me_cl->props.protocol_name,
44
+			   me_cl->props.max_number_of_connections,
45
+			   me_cl->props.max_msg_length,
46
+			   me_cl->props.single_recv_buf,
47
+			   kref_read(&me_cl->refcnt),
48
+			   me_cl->props.vt_supported);
49
+		mei_me_cl_put(me_cl);
7450 	}
7551 
7652 out:
7753 	up_read(&dev->me_clients_rwsem);
78
-	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
79
-	kfree(buf);
80
-	return ret;
54
+	return 0;
8155 }
56
+DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_meclients);
8257 
83
-static const struct file_operations mei_dbgfs_fops_meclients = {
84
-	.open = simple_open,
85
-	.read = mei_dbgfs_read_meclients,
86
-	.llseek = generic_file_llseek,
87
-};
88
-
89
-static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,
90
-					size_t cnt, loff_t *ppos)
58
+static int mei_dbgfs_active_show(struct seq_file *m, void *unused)
9159 {
92
-	struct mei_device *dev = fp->private_data;
60
+	struct mei_device *dev = m->private;
9361 	struct mei_cl *cl;
94
-	size_t bufsz = 1;
95
-	char *buf;
9662 	int i = 0;
97
-	int pos = 0;
98
-	int ret;
99
-
100
-#define HDR "   |me|host|state|rd|wr|wrq\n"
10163 
10264 	if (!dev)
10365 		return -ENODEV;
10466 
10567 	mutex_lock(&dev->device_lock);
10668 
107
-	/*
108
-	 * if the driver is not enabled the list won't be consistent,
109
-	 * we output empty table
110
-	 */
111
-	if (dev->dev_state == MEI_DEV_ENABLED)
112
-		list_for_each_entry(cl, &dev->file_list, link)
113
-			bufsz++;
114
-
115
-	bufsz *= sizeof(HDR) + 1;
116
-
117
-	buf = kzalloc(bufsz, GFP_KERNEL);
118
-	if  (!buf) {
119
-		mutex_unlock(&dev->device_lock);
120
-		return -ENOMEM;
121
-	}
122
-
123
-	pos += scnprintf(buf + pos, bufsz - pos, HDR);
124
-#undef HDR
69
+	seq_puts(m, "   |me|host|state|rd|wr|wrq\n");
12570 
12671 	/*  if the driver is not enabled the list won't be consistent */
12772 	if (dev->dev_state != MEI_DEV_ENABLED)
....@@ -129,76 +74,46 @@
12974 
13075 	list_for_each_entry(cl, &dev->file_list, link) {
13176 
132
-		pos += scnprintf(buf + pos, bufsz - pos,
133
-			"%3d|%2d|%4d|%5d|%2d|%2d|%3u\n",
134
-			i, mei_cl_me_id(cl), cl->host_client_id, cl->state,
135
-			!list_empty(&cl->rd_completed), cl->writing_state,
136
-			cl->tx_cb_queued);
77
+		seq_printf(m, "%3d|%2d|%4d|%5d|%2d|%2d|%3u\n",
78
+			   i, mei_cl_me_id(cl), cl->host_client_id, cl->state,
79
+			   !list_empty(&cl->rd_completed), cl->writing_state,
80
+			   cl->tx_cb_queued);
13781 		i++;
13882 	}
13983 out:
14084 	mutex_unlock(&dev->device_lock);
141
-	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
142
-	kfree(buf);
143
-	return ret;
85
+	return 0;
14486 }
87
+DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_active);
14588 
146
-static const struct file_operations mei_dbgfs_fops_active = {
147
-	.open = simple_open,
148
-	.read = mei_dbgfs_read_active,
149
-	.llseek = generic_file_llseek,
150
-};
151
-
152
-static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
153
-					size_t cnt, loff_t *ppos)
89
+static int mei_dbgfs_devstate_show(struct seq_file *m, void *unused)
15490 {
155
-	struct mei_device *dev = fp->private_data;
156
-	const size_t bufsz = 1024;
157
-	char *buf = kzalloc(bufsz, GFP_KERNEL);
158
-	int pos = 0;
159
-	int ret;
91
+	struct mei_device *dev = m->private;
16092 
161
-	if  (!buf)
162
-		return -ENOMEM;
163
-
164
-	pos += scnprintf(buf + pos, bufsz - pos, "dev: %s\n",
165
-			mei_dev_state_str(dev->dev_state));
166
-	pos += scnprintf(buf + pos, bufsz - pos, "hbm: %s\n",
167
-			mei_hbm_state_str(dev->hbm_state));
93
+	seq_printf(m, "dev: %s\n", mei_dev_state_str(dev->dev_state));
94
+	seq_printf(m, "hbm: %s\n", mei_hbm_state_str(dev->hbm_state));
16895 
16996 	if (dev->hbm_state >= MEI_HBM_ENUM_CLIENTS &&
17097 	    dev->hbm_state <= MEI_HBM_STARTED) {
171
-		pos += scnprintf(buf + pos, bufsz - pos, "hbm features:\n");
172
-		pos += scnprintf(buf + pos, bufsz - pos, "\tPG: %01d\n",
173
-				 dev->hbm_f_pg_supported);
174
-		pos += scnprintf(buf + pos, bufsz - pos, "\tDC: %01d\n",
175
-				 dev->hbm_f_dc_supported);
176
-		pos += scnprintf(buf + pos, bufsz - pos, "\tIE: %01d\n",
177
-				 dev->hbm_f_ie_supported);
178
-		pos += scnprintf(buf + pos, bufsz - pos, "\tDOT: %01d\n",
179
-				 dev->hbm_f_dot_supported);
180
-		pos += scnprintf(buf + pos, bufsz - pos, "\tEV: %01d\n",
181
-				 dev->hbm_f_ev_supported);
182
-		pos += scnprintf(buf + pos, bufsz - pos, "\tFA: %01d\n",
183
-				 dev->hbm_f_fa_supported);
184
-		pos += scnprintf(buf + pos, bufsz - pos, "\tOS: %01d\n",
185
-				 dev->hbm_f_os_supported);
186
-		pos += scnprintf(buf + pos, bufsz - pos, "\tDR: %01d\n",
187
-				 dev->hbm_f_dr_supported);
98
+		seq_puts(m, "hbm features:\n");
99
+		seq_printf(m, "\tPG: %01d\n", dev->hbm_f_pg_supported);
100
+		seq_printf(m, "\tDC: %01d\n", dev->hbm_f_dc_supported);
101
+		seq_printf(m, "\tIE: %01d\n", dev->hbm_f_ie_supported);
102
+		seq_printf(m, "\tDOT: %01d\n", dev->hbm_f_dot_supported);
103
+		seq_printf(m, "\tEV: %01d\n", dev->hbm_f_ev_supported);
104
+		seq_printf(m, "\tFA: %01d\n", dev->hbm_f_fa_supported);
105
+		seq_printf(m, "\tOS: %01d\n", dev->hbm_f_os_supported);
106
+		seq_printf(m, "\tDR: %01d\n", dev->hbm_f_dr_supported);
107
+		seq_printf(m, "\tVT: %01d\n", dev->hbm_f_vt_supported);
108
+		seq_printf(m, "\tCAP: %01d\n", dev->hbm_f_cap_supported);
188109 	}
189110 
190
-	pos += scnprintf(buf + pos, bufsz - pos, "pg:  %s, %s\n",
191
-			mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED",
192
-			mei_pg_state_str(mei_pg_state(dev)));
193
-	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
194
-	kfree(buf);
195
-	return ret;
111
+	seq_printf(m, "pg:  %s, %s\n",
112
+		   mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED",
113
+		   mei_pg_state_str(mei_pg_state(dev)));
114
+	return 0;
196115 }
197
-static const struct file_operations mei_dbgfs_fops_devstate = {
198
-	.open = simple_open,
199
-	.read = mei_dbgfs_read_devstate,
200
-	.llseek = generic_file_llseek,
201
-};
116
+DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_devstate);
202117 
203118 static ssize_t mei_dbgfs_write_allow_fa(struct file *file,
204119 					const char __user *user_buf,
....@@ -217,7 +132,7 @@
217132 	return ret;
218133 }
219134 
220
-static const struct file_operations mei_dbgfs_fops_allow_fa = {
135
+static const struct file_operations mei_dbgfs_allow_fa_fops = {
221136 	.open = simple_open,
222137 	.read = debugfs_read_file_bool,
223138 	.write = mei_dbgfs_write_allow_fa,
....@@ -242,47 +157,21 @@
242157  *
243158  * @dev: the mei device structure
244159  * @name: the mei device name
245
- *
246
- * Return: 0 on success, <0 on failure.
247160  */
248
-int mei_dbgfs_register(struct mei_device *dev, const char *name)
161
+void mei_dbgfs_register(struct mei_device *dev, const char *name)
249162 {
250
-	struct dentry *dir, *f;
163
+	struct dentry *dir;
251164 
252165 	dir = debugfs_create_dir(name, NULL);
253
-	if (!dir)
254
-		return -ENOMEM;
255
-
256166 	dev->dbgfs_dir = dir;
257167 
258
-	f = debugfs_create_file("meclients", S_IRUSR, dir,
259
-				dev, &mei_dbgfs_fops_meclients);
260
-	if (!f) {
261
-		dev_err(dev->dev, "meclients: registration failed\n");
262
-		goto err;
263
-	}
264
-	f = debugfs_create_file("active", S_IRUSR, dir,
265
-				dev, &mei_dbgfs_fops_active);
266
-	if (!f) {
267
-		dev_err(dev->dev, "active: registration failed\n");
268
-		goto err;
269
-	}
270
-	f = debugfs_create_file("devstate", S_IRUSR, dir,
271
-				dev, &mei_dbgfs_fops_devstate);
272
-	if (!f) {
273
-		dev_err(dev->dev, "devstate: registration failed\n");
274
-		goto err;
275
-	}
276
-	f = debugfs_create_file("allow_fixed_address", S_IRUSR | S_IWUSR, dir,
277
-				&dev->allow_fixed_address,
278
-				&mei_dbgfs_fops_allow_fa);
279
-	if (!f) {
280
-		dev_err(dev->dev, "allow_fixed_address: registration failed\n");
281
-		goto err;
282
-	}
283
-	return 0;
284
-err:
285
-	mei_dbgfs_deregister(dev);
286
-	return -ENODEV;
168
+	debugfs_create_file("meclients", S_IRUSR, dir, dev,
169
+			    &mei_dbgfs_meclients_fops);
170
+	debugfs_create_file("active", S_IRUSR, dir, dev,
171
+			    &mei_dbgfs_active_fops);
172
+	debugfs_create_file("devstate", S_IRUSR, dir, dev,
173
+			    &mei_dbgfs_devstate_fops);
174
+	debugfs_create_file("allow_fixed_address", S_IRUSR | S_IWUSR, dir,
175
+			    &dev->allow_fixed_address,
176
+			    &mei_dbgfs_allow_fa_fops);
287177 }
288
-