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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
/*
* litmus_proc.c -- Implementation of the /proc/litmus directory tree.
*/
#include <linux/uaccess.h>
#include <litmus/litmus.h>
#include <litmus/litmus_proc.h>
/* in litmus/litmus.c */
extern atomic_t rt_task_count;
static struct proc_dir_entry *litmus_dir = NULL,
*curr_file = NULL,
*stat_file = NULL,
*plugs_dir = NULL,
#ifdef CONFIG_RELEASE_MASTER
*release_master_file = NULL,
#endif
*plugs_file = NULL;
/* in litmus/sync.c */
int count_tasks_waiting_for_release(void);
static int proc_read_stats(char *page, char **start,
off_t off, int count,
int *eof, void *data)
{
int len;
len = snprintf(page, PAGE_SIZE,
"real-time tasks = %d\n"
"ready for release = %d\n",
atomic_read(&rt_task_count),
count_tasks_waiting_for_release());
return len;
}
static int proc_read_plugins(char *page, char **start,
off_t off, int count,
int *eof, void *data)
{
int len;
len = print_sched_plugins(page, PAGE_SIZE);
return len;
}
static int proc_read_curr(char *page, char **start,
off_t off, int count,
int *eof, void *data)
{
int len;
len = snprintf(page, PAGE_SIZE, "%s\n", litmus->plugin_name);
return len;
}
/* in litmus/litmus.c */
int switch_sched_plugin(struct sched_plugin*);
static int proc_write_curr(struct file *file,
const char *buffer,
unsigned long count,
void *data)
{
int len, ret;
char name[65];
struct sched_plugin* found;
if(count > 64)
len = 64;
else
len = count;
if(copy_from_user(name, buffer, len))
return -EFAULT;
name[len] = '\0';
/* chomp name */
if (len > 1 && name[len - 1] == '\n')
name[len - 1] = '\0';
found = find_sched_plugin(name);
if (found) {
ret = switch_sched_plugin(found);
if (ret != 0)
printk(KERN_INFO "Could not switch plugin: %d\n", ret);
} else
printk(KERN_INFO "Plugin '%s' is unknown.\n", name);
return len;
}
#ifdef CONFIG_RELEASE_MASTER
static int proc_read_release_master(char *page, char **start,
off_t off, int count,
int *eof, void *data)
{
int len, master;
master = atomic_read(&release_master_cpu);
if (master == NO_CPU)
len = snprintf(page, PAGE_SIZE, "NO_CPU\n");
else
len = snprintf(page, PAGE_SIZE, "%d\n", master);
return len;
}
static int proc_write_release_master(struct file *file,
const char *buffer,
unsigned long count,
void *data)
{
int cpu, err, online = 0;
char msg[64];
if (count > 63)
return -EINVAL;
if (copy_from_user(msg, buffer, count))
return -EFAULT;
/* terminate */
msg[count] = '\0';
/* chomp */
if (count > 1 && msg[count - 1] == '\n')
msg[count - 1] = '\0';
if (strcmp(msg, "NO_CPU") == 0) {
atomic_set(&release_master_cpu, NO_CPU);
return count;
} else {
err = sscanf(msg, "%d", &cpu);
if (err == 1 && cpu >= 0 && (online = cpu_online(cpu))) {
atomic_set(&release_master_cpu, cpu);
return count;
} else {
TRACE("invalid release master: '%s' "
"(err:%d cpu:%d online:%d)\n",
msg, err, cpu, online);
return -EINVAL;
}
}
}
#endif
int __init init_litmus_proc(void)
{
litmus_dir = proc_mkdir("litmus", NULL);
if (!litmus_dir) {
printk(KERN_ERR "Could not allocate LITMUS^RT procfs entry.\n");
return -ENOMEM;
}
curr_file = create_proc_entry("active_plugin",
0644, litmus_dir);
if (!curr_file) {
printk(KERN_ERR "Could not allocate active_plugin "
"procfs entry.\n");
return -ENOMEM;
}
curr_file->read_proc = proc_read_curr;
curr_file->write_proc = proc_write_curr;
#ifdef CONFIG_RELEASE_MASTER
release_master_file = create_proc_entry("release_master",
0644, litmus_dir);
if (!release_master_file) {
printk(KERN_ERR "Could not allocate release_master "
"procfs entry.\n");
return -ENOMEM;
}
release_master_file->read_proc = proc_read_release_master;
release_master_file->write_proc = proc_write_release_master;
#endif
stat_file = create_proc_read_entry("stats", 0444, litmus_dir,
proc_read_stats, NULL);
plugs_dir = proc_mkdir("plugins", litmus_dir);
if (!plugs_dir){
printk(KERN_ERR "Could not allocate plugins directory "
"procfs entry.\n");
return -ENOMEM;
}
plugs_file = create_proc_read_entry("loaded", 0444, plugs_dir,
proc_read_plugins, NULL);
return 0;
}
void exit_litmus_proc(void)
{
if (plugs_file)
remove_proc_entry("loaded", plugs_dir);
if (plugs_dir)
remove_proc_entry("plugins", litmus_dir);
if (stat_file)
remove_proc_entry("stats", litmus_dir);
if (curr_file)
remove_proc_entry("active_plugin", litmus_dir);
#ifdef CONFIG_RELEASE_MASTER
if (release_master_file)
remove_proc_entry("release_master", litmus_dir);
#endif
if (litmus_dir)
remove_proc_entry("litmus", NULL);
}
long make_plugin_proc_dir(struct sched_plugin* plugin,
struct proc_dir_entry** pde_in)
{
struct proc_dir_entry *pde_new = NULL;
long rv;
if (!plugin || !plugin->plugin_name){
printk(KERN_ERR "Invalid plugin struct passed to %s.\n",
__func__);
rv = -EINVAL;
goto out_no_pde;
}
if (!plugs_dir){
printk(KERN_ERR "Could not make plugin sub-directory, because "
"/proc/litmus/plugins does not exist.\n");
rv = -ENOENT;
goto out_no_pde;
}
pde_new = proc_mkdir(plugin->plugin_name, plugs_dir);
if (!pde_new){
printk(KERN_ERR "Could not make plugin sub-directory: "
"out of memory?.\n");
rv = -ENOMEM;
goto out_no_pde;
}
rv = 0;
*pde_in = pde_new;
goto out_ok;
out_no_pde:
*pde_in = NULL;
out_ok:
return rv;
}
void remove_plugin_proc_dir(struct sched_plugin* plugin)
{
if (!plugin || !plugin->plugin_name){
printk(KERN_ERR "Invalid plugin struct passed to %s.\n",
__func__);
return;
}
remove_proc_entry(plugin->plugin_name, plugs_dir);
}
|
