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6
7#include <linux/debugfs.h>
8#include "vchiq_core.h"
9#include "vchiq_arm.h"
10#include "vchiq_debugfs.h"
11
12#ifdef CONFIG_DEBUG_FS
13
14
15
16
17
18
19#define DEBUGFS_WRITE_BUF_SIZE 256
20
21#define VCHIQ_LOG_ERROR_STR "error"
22#define VCHIQ_LOG_WARNING_STR "warning"
23#define VCHIQ_LOG_INFO_STR "info"
24#define VCHIQ_LOG_TRACE_STR "trace"
25
26
27static struct dentry *vchiq_dbg_dir;
28static struct dentry *vchiq_dbg_clients;
29
30
31struct vchiq_debugfs_log_entry {
32 const char *name;
33 void *plevel;
34};
35
36static struct vchiq_debugfs_log_entry vchiq_debugfs_log_entries[] = {
37 { "core", &vchiq_core_log_level },
38 { "msg", &vchiq_core_msg_log_level },
39 { "sync", &vchiq_sync_log_level },
40 { "susp", &vchiq_susp_log_level },
41 { "arm", &vchiq_arm_log_level },
42};
43static int n_log_entries = ARRAY_SIZE(vchiq_debugfs_log_entries);
44
45static int debugfs_log_show(struct seq_file *f, void *offset)
46{
47 int *levp = f->private;
48 char *log_value = NULL;
49
50 switch (*levp) {
51 case VCHIQ_LOG_ERROR:
52 log_value = VCHIQ_LOG_ERROR_STR;
53 break;
54 case VCHIQ_LOG_WARNING:
55 log_value = VCHIQ_LOG_WARNING_STR;
56 break;
57 case VCHIQ_LOG_INFO:
58 log_value = VCHIQ_LOG_INFO_STR;
59 break;
60 case VCHIQ_LOG_TRACE:
61 log_value = VCHIQ_LOG_TRACE_STR;
62 break;
63 default:
64 break;
65 }
66
67 seq_printf(f, "%s\n", log_value ? log_value : "(null)");
68
69 return 0;
70}
71
72static int debugfs_log_open(struct inode *inode, struct file *file)
73{
74 return single_open(file, debugfs_log_show, inode->i_private);
75}
76
77static ssize_t debugfs_log_write(struct file *file,
78 const char __user *buffer,
79 size_t count, loff_t *ppos)
80{
81 struct seq_file *f = (struct seq_file *)file->private_data;
82 int *levp = f->private;
83 char kbuf[DEBUGFS_WRITE_BUF_SIZE + 1];
84
85 memset(kbuf, 0, DEBUGFS_WRITE_BUF_SIZE + 1);
86 if (count >= DEBUGFS_WRITE_BUF_SIZE)
87 count = DEBUGFS_WRITE_BUF_SIZE;
88
89 if (copy_from_user(kbuf, buffer, count))
90 return -EFAULT;
91 kbuf[count - 1] = 0;
92
93 if (strncmp("error", kbuf, strlen("error")) == 0)
94 *levp = VCHIQ_LOG_ERROR;
95 else if (strncmp("warning", kbuf, strlen("warning")) == 0)
96 *levp = VCHIQ_LOG_WARNING;
97 else if (strncmp("info", kbuf, strlen("info")) == 0)
98 *levp = VCHIQ_LOG_INFO;
99 else if (strncmp("trace", kbuf, strlen("trace")) == 0)
100 *levp = VCHIQ_LOG_TRACE;
101 else
102 *levp = VCHIQ_LOG_DEFAULT;
103
104 *ppos += count;
105
106 return count;
107}
108
109static const struct file_operations debugfs_log_fops = {
110 .owner = THIS_MODULE,
111 .open = debugfs_log_open,
112 .write = debugfs_log_write,
113 .read = seq_read,
114 .llseek = seq_lseek,
115 .release = single_release,
116};
117
118static int debugfs_usecount_show(struct seq_file *f, void *offset)
119{
120 VCHIQ_INSTANCE_T instance = f->private;
121 int use_count;
122
123 use_count = vchiq_instance_get_use_count(instance);
124 seq_printf(f, "%d\n", use_count);
125
126 return 0;
127}
128DEFINE_SHOW_ATTRIBUTE(debugfs_usecount);
129
130static int debugfs_trace_show(struct seq_file *f, void *offset)
131{
132 VCHIQ_INSTANCE_T instance = f->private;
133 int trace;
134
135 trace = vchiq_instance_get_trace(instance);
136 seq_printf(f, "%s\n", trace ? "Y" : "N");
137
138 return 0;
139}
140
141static int debugfs_trace_open(struct inode *inode, struct file *file)
142{
143 return single_open(file, debugfs_trace_show, inode->i_private);
144}
145
146static ssize_t debugfs_trace_write(struct file *file,
147 const char __user *buffer,
148 size_t count, loff_t *ppos)
149{
150 struct seq_file *f = (struct seq_file *)file->private_data;
151 VCHIQ_INSTANCE_T instance = f->private;
152 char firstchar;
153
154 if (copy_from_user(&firstchar, buffer, 1))
155 return -EFAULT;
156
157 switch (firstchar) {
158 case 'Y':
159 case 'y':
160 case '1':
161 vchiq_instance_set_trace(instance, 1);
162 break;
163 case 'N':
164 case 'n':
165 case '0':
166 vchiq_instance_set_trace(instance, 0);
167 break;
168 default:
169 break;
170 }
171
172 *ppos += count;
173
174 return count;
175}
176
177static const struct file_operations debugfs_trace_fops = {
178 .owner = THIS_MODULE,
179 .open = debugfs_trace_open,
180 .write = debugfs_trace_write,
181 .read = seq_read,
182 .llseek = seq_lseek,
183 .release = single_release,
184};
185
186
187void vchiq_debugfs_add_instance(VCHIQ_INSTANCE_T instance)
188{
189 char pidstr[16];
190 struct dentry *top;
191
192 snprintf(pidstr, sizeof(pidstr), "%d",
193 vchiq_instance_get_pid(instance));
194
195 top = debugfs_create_dir(pidstr, vchiq_dbg_clients);
196
197 debugfs_create_file("use_count", 0444, top, instance,
198 &debugfs_usecount_fops);
199 debugfs_create_file("trace", 0644, top, instance, &debugfs_trace_fops);
200
201 vchiq_instance_get_debugfs_node(instance)->dentry = top;
202}
203
204void vchiq_debugfs_remove_instance(VCHIQ_INSTANCE_T instance)
205{
206 struct vchiq_debugfs_node *node =
207 vchiq_instance_get_debugfs_node(instance);
208
209 debugfs_remove_recursive(node->dentry);
210}
211
212void vchiq_debugfs_init(void)
213{
214 struct dentry *dir;
215 int i;
216
217 vchiq_dbg_dir = debugfs_create_dir("vchiq", NULL);
218 vchiq_dbg_clients = debugfs_create_dir("clients", vchiq_dbg_dir);
219
220
221 dir = debugfs_create_dir("log", vchiq_dbg_dir);
222
223 for (i = 0; i < n_log_entries; i++)
224 debugfs_create_file(vchiq_debugfs_log_entries[i].name, 0644,
225 dir, vchiq_debugfs_log_entries[i].plevel,
226 &debugfs_log_fops);
227}
228
229
230void vchiq_debugfs_deinit(void)
231{
232 debugfs_remove_recursive(vchiq_dbg_dir);
233}
234
235#else
236
237void vchiq_debugfs_init(void)
238{
239}
240
241void vchiq_debugfs_deinit(void)
242{
243}
244
245void vchiq_debugfs_add_instance(VCHIQ_INSTANCE_T instance)
246{
247}
248
249void vchiq_debugfs_remove_instance(VCHIQ_INSTANCE_T instance)
250{
251}
252
253#endif
254
