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#include <linux/module.h>
#include <linux/sysctl.h>
#include <linux/slab.h>
#include <litmus/sched_trace.h>
#define SPERIOD_LEN 7
#define SPERIOD_FILE "period"
#define SWCET_LEN 5
#define SWCET_FILE "wcet"
static unsigned long *server_wcet;
static unsigned long *server_period;
static struct ctl_table litmus_table[] =
{
{
.procname = "color",
.mode = 0555,
},
{ }
};
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)
{
if (cpu >= num_online_cpus()) {
printk(KERN_WARNING "Cannot access illegal CPU: %d\n", cpu);
return -EFAULT;
}
if (server_wcet[cpu] == ULONG_MAX || server_period[cpu] == ULONG_MAX) {
printk(KERN_WARNING "Server %d is uninitialized!\n", cpu);
return -EPERM;
}
*wcet = server_wcet[cpu];
*period = server_period[cpu];
TRACE("For %d: %lu, %lu\n", cpu, server_wcet[cpu], server_period[cpu]);
return 0;
}
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(unsigned long);
}
static int __init init_cpu_entry(struct ctl_table *cpu_table, int cpu)
{
char *name;
size_t size;
struct ctl_table *server_table, *entry;
server_wcet[cpu] = ULONG_MAX;
server_period[cpu] = ULONG_MAX;
printk(KERN_INFO "Creating cpu %d\n", cpu);
size = sizeof(ctl_table) * 3;
server_table = kmalloc(size, GFP_ATOMIC);
if (!server_table) {
printk(KERN_WARNING "Could not allocate "
"color server proc for CPU %d.\n", cpu);
return -ENOMEM;
}
memset(server_table, 0, size);
/* Server WCET */
name = kmalloc(SWCET_LEN, GFP_ATOMIC);
if (!name) {
return -ENOMEM;
}
strcpy(name, SWCET_FILE);
entry = &server_table[0];
init_server_entry(entry, &server_wcet[cpu], name);
/* Server period */
name = kmalloc(SPERIOD_LEN, GFP_ATOMIC);
if (!name) {
return -ENOMEM;
}
strcpy(name, SPERIOD_FILE);
entry = &server_table[1];
init_server_entry(entry, &server_period[cpu], name);
name = kmalloc(3, GFP_ATOMIC);
if (!name) {
return -ENOMEM;
}
snprintf(name, 2, "%d", cpu);
cpu_table->procname = name;
cpu_table->mode = 0555;
cpu_table->child = server_table;
return 0;
}
static int __init init_server_entries(struct ctl_table *cpu_tables)
{
size_t size;
int ret, cpu;
struct ctl_table *cpu_table;
size = sizeof(unsigned long) * num_online_cpus();
server_wcet = kmalloc(size, GFP_ATOMIC);
server_period = kmalloc(size, GFP_ATOMIC);
if (!server_wcet || !server_period) {
printk(KERN_WARNING "Could not allocate server parameters.\n");
return -ENOMEM;
}
for_each_online_cpu(cpu) {
cpu_table = &cpu_tables[cpu];
ret = init_cpu_entry(cpu_table, cpu);
if (ret) {
return ret;
}
}
return 0;
}
static struct ctl_table_header *litmus_sysctls;
static int __init litmus_sysctl_init(void)
{
int ret;
size_t size;
struct ctl_table *cpu_tables;
printk(KERN_INFO "Registering LITMUS^RT sysctl.\n");
size = sizeof(ctl_table) * (num_online_cpus() + 2);
cpu_tables = kmalloc(size, GFP_ATOMIC);
if (!cpu_tables) {
printk(KERN_WARNING "Could not allocate color CPU proc.\n");
}
memset(cpu_tables, 0, size);
ret = init_server_entries(cpu_tables);
if (ret) {
return ret;
}
litmus_table->child = cpu_tables;
litmus_sysctls = register_sysctl_table(litmus_dir_table);
if (!litmus_sysctls) {
printk(KERN_WARNING "Could not register LITMUS^RT sysctl.\n");
return -EFAULT;
}
return 0;
}
module_init(litmus_sysctl_init);
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