1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/* modem_dbg.c
*
* Copyright (C) 2010 Google, Inc.
* Copyright (C) 2010 Samsung Electronics.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/wakelock.h>
#include <linux/miscdevice.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include "modem_ctl.h"
#include "modem_ctl_p.h"
static int crash_open(struct inode *inode, struct file *file)
{
struct modemctl *mc = inode->i_private;
modem_force_crash(mc);
return 0;
}
static const struct file_operations crash_ops = {
.open = crash_open,
};
#define SHOW(name) seq_printf(sf, "%-20s %d\n", #name, stats->name)
static int stats_show(struct seq_file *sf, void *unused)
{
struct modemstats *stats = sf->private;
SHOW(request_no_wait);
SHOW(request_wait);
SHOW(release_no_action);
SHOW(release_bp_waiting);
SHOW(release_bp_signaled);
SHOW(bp_req_instant);
SHOW(bp_req_delayed);
SHOW(bp_req_confused);
SHOW(rx_unknown);
SHOW(rx_dropped);
SHOW(rx_purged);
SHOW(rx_received);
SHOW(tx_no_delay);
SHOW(tx_queued);
SHOW(tx_bp_signaled);
SHOW(tx_fifo_full);
SHOW(pipe_tx);
SHOW(pipe_rx);
SHOW(pipe_tx_delayed);
SHOW(pipe_rx_purged);
SHOW(resets);
return 0;
}
static int stats_open(struct inode *inode, struct file *file)
{
struct modemctl *mc = inode->i_private;
struct modemstats *stats;
unsigned long int flags;
int ret;
stats = kzalloc(sizeof(*stats), GFP_KERNEL);
if (!stats)
return -ENOMEM;
spin_lock_irqsave(&mc->lock, flags);
memcpy(stats, &mc->stats, sizeof(*stats));
memset(&mc->stats, 0, sizeof(*stats));
spin_unlock_irqrestore(&mc->lock, flags);
ret = single_open(file, stats_show, stats);
if (ret)
kfree(stats);
return ret;
}
static int stats_release(struct inode *inode, struct file *file)
{
struct seq_file *seq = file->private_data;
struct modemstats *stats = seq->private;
int ret;
ret = single_release(inode, file);
kfree(stats);
return ret;
}
static const struct file_operations stats_ops = {
.open = stats_open,
.release = stats_release,
.read = seq_read,
.llseek = seq_lseek,
};
static int log_open(struct inode *inode, struct file *file)
{
struct modemctl *mc = inode->i_private;
unsigned long int flags;
int ret = 0;
file->private_data = mc;
mutex_lock(&mc->ctl_lock);
if (mc->logdump) {
mutex_unlock(&mc->ctl_lock);
return -EBUSY;
}
mc->logdump = 1;
mutex_unlock(&mc->ctl_lock);
spin_lock_irqsave(&mc->lock, flags);
mc->logdump_data = 0;
pr_err("modem: send LOGDUMP\n");
writel(MODEM_CMD_LOGDUMP_START, mc->mmio + OFF_MBOX_AP);
spin_unlock_irqrestore(&mc->lock, flags);
ret = wait_event_timeout(mc->wq, mc->logdump_data, 10 * HZ);
if (ret == 0) {
mutex_lock(&mc->ctl_lock);
mc->logdump = 0;
mutex_unlock(&mc->ctl_lock);
return -ETIMEDOUT;
} else {
return 0;
}
}
static int log_release(struct inode *inode, struct file *file)
{
struct modemctl *mc = file->private_data;
mutex_lock(&mc->ctl_lock);
mc->logdump = 0;
mutex_unlock(&mc->ctl_lock);
return 0;
}
static ssize_t log_read(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
struct modemctl *mc = filp->private_data;
loff_t pos = *ppos;
int ret;
if (pos < 0)
return -EINVAL;
if (pos >= SIZ_LOGDUMP_DATA)
return 0;
ret = modem_acquire_mmio(mc);
if (ret)
return ret;
mutex_lock(&mc->ctl_lock);
if (count > SIZ_LOGDUMP_DATA - pos)
count = SIZ_LOGDUMP_DATA - pos;
ret = copy_to_user(buf, mc->mmio + OFF_LOGDUMP_DATA + pos, count);
if (ret) {
ret = -EFAULT;
} else {
pos += count;
ret = count;
}
*ppos = pos;
mutex_unlock(&mc->ctl_lock);
modem_release_mmio(mc, 0);
return ret;
}
static const struct file_operations log_ops = {
.open = log_open,
.release = log_release,
.read = log_read,
};
void modem_debugfs_init(struct modemctl *mc)
{
struct dentry *dent;
dent = debugfs_create_dir("modemctl", 0);
if (IS_ERR(dent))
return;
debugfs_create_file("crash", 0200, dent, mc, &crash_ops);
debugfs_create_file("stats", 0444, dent, mc, &stats_ops);
debugfs_create_file("log", 0440, dent, mc, &log_ops);
}
|
