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
|
#include <linux/module.h>
#include <linux/sysctl.h>
#include <linux/slab.h>
#include <litmus/sched_trace.h>
#include <litmus/color.h>
extern int color_sysctl_add_pages_data; /* litmus/color.c */
static int zero = 0;
static int one = 1;
/* used as names for server proc entries */
static char *period_str = "period";
static char *wcet_str = "wcet";
/* servers have a WCET and period */
#define NR_SERVER_PARAMS 2
#define CPU_NAME_LEN 3
struct color_cpu_server {
char name[CPU_NAME_LEN];
unsigned long wcet;
unsigned long period;
/* the + 1 is for the sentinel element */
struct ctl_table table[NR_SERVER_PARAMS + 1];
};
static struct color_cpu_server color_cpu_servers[NR_CPUS];
/* the + 1 is for the sentinel element */
static struct ctl_table color_cpu_tables[NR_CPUS + 1];
#define INFO_BUFFER_SIZE 100
static char info_buffer[100];
#define NR_PAGES_INDEX 0 /* location of nr_pages in the table below */
static struct ctl_table color_table[] =
{
{
/* you MUST update NR_PAGES_INDEX if you move this entry */
.procname = "nr_pages",
.mode = 0444,
.proc_handler = color_nr_pages_handler,
.data = NULL, /* dynamically set later */
.maxlen = 0, /* also set later */
},
{
.procname = "servers",
.mode = 0555,
.child = color_cpu_tables,
},
{
.procname = "add_pages",
.data = &color_sysctl_add_pages_data,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = color_add_pages_handler,
.extra1 = &zero,
.extra2 = &one,
},
{
.procname = "cache_info",
.mode = 0444,
.proc_handler = proc_dostring,
.data = info_buffer,
.maxlen = INFO_BUFFER_SIZE,
},
{ }
};
static struct ctl_table litmus_table[] =
{
{
.procname = "color",
.mode = 0555,
.child = color_table,
},
{ }
};
static struct ctl_table litmus_dir_table[] = {
{
.procname = "litmus",
.mode = 0555,
.child = litmus_table,
},
{ }
};
int color_server_params(int cpu, unsigned long *wcet, unsigned long *period)
{
struct color_cpu_server *svr;
if (cpu >= num_online_cpus()) {
printk(KERN_WARNING "Cannot access illegal CPU: %d\n", cpu);
return -EFAULT;
}
svr = &color_cpu_servers[cpu];
if (svr->wcet == 0 || svr->period == 0) {
printk(KERN_WARNING "Server %d is uninitialized!\n", cpu);
return -EPERM;
}
*wcet = svr->wcet;
*period = svr->period;
TRACE("For %d: %lu, %lu\n", cpu, svr->wcet, svr->period);
return 0;
}
/* must be called AFTER nr_colors is set */
static int __init init_sysctl_nr_colors(void)
{
int ret = 0, maxlen = ONE_COLOR_LEN * color_cache_info.nr_colors;
color_table[NR_PAGES_INDEX].data = kmalloc(maxlen, GFP_KERNEL);
if (!color_table[NR_PAGES_INDEX].data) {
printk(KERN_WARNING "Could not allocate nr_pages buffer.\n");
ret = -ENOMEM;
goto out;
}
color_table[NR_PAGES_INDEX].maxlen = maxlen;
out:
return ret;
}
static void __init init_server_entry(struct ctl_table *entry,
unsigned long *parameter,
char *name)
{
entry->procname = name;
entry->mode = 0666;
entry->proc_handler = proc_doulongvec_minmax;
entry->data = parameter;
entry->maxlen = sizeof(*parameter);
}
static int __init init_cpu_entry(struct ctl_table *cpu_table,
struct color_cpu_server *svr, int cpu)
{
struct ctl_table *entry = svr->table;
printk(KERN_INFO "Creating cpu %d\n", cpu);
init_server_entry(entry, &svr->wcet, wcet_str);
entry++;
init_server_entry(entry, &svr->period, period_str);
/* minus one for the null byte */
snprintf(svr->name, CPU_NAME_LEN - 1, "%d", cpu);
cpu_table->procname = svr->name;
cpu_table->mode = 0555;
cpu_table->child = svr->table;
return 0;
}
static int __init init_server_entries(void)
{
int cpu, err = 0;
struct ctl_table *cpu_table;
struct color_cpu_server *svr;
for_each_online_cpu(cpu) {
cpu_table = &color_cpu_tables[cpu];
svr = &color_cpu_servers[cpu];
err = init_cpu_entry(cpu_table, svr, cpu);
if (err)
goto out;
}
out:
return err;
}
static struct ctl_table_header *litmus_sysctls;
static int __init litmus_sysctl_init(void)
{
int ret = 0;
printk(KERN_INFO "Registering LITMUS^RT proc sysctl.\n");
litmus_sysctls = register_sysctl_table(litmus_dir_table);
if (!litmus_sysctls) {
printk(KERN_WARNING "Could not register LITMUS^RT sysctl.\n");
ret = -EFAULT;
goto out;
}
ret = init_sysctl_nr_colors();
if (ret)
goto out;
ret = init_server_entries();
if (ret)
goto out;
snprintf(info_buffer, INFO_BUFFER_SIZE,
"Cache size\t: %lu B\n"
"Line size\t: %lu B\n"
"Page size\t: %lu B\n"
"Ways\t\t: %lu\n"
"Sets\t\t: %lu\n"
"Colors\t\t: %lu",
color_cache_info.size, color_cache_info.line_size, PAGE_SIZE,
color_cache_info.ways, color_cache_info.sets,
color_cache_info.nr_colors);
out:
return ret;
}
module_init(litmus_sysctl_init);
|
