static int __init oprofile_init(void)
{
int err;
/* always init architecture to setup backtrace support */
err = oprofile_arch_init(&oprofile_ops);
timer_mode = err || timer; /* fall back to timer mode on errors */
if (timer_mode) {
if (!err)
oprofile_arch_exit();
err = oprofile_timer_init(&oprofile_ops);
if (err)
return err;
}
err = oprofilefs_register();
if (!err)
return 0;
/* failed */
if (timer_mode)
oprofile_timer_exit();
else
oprofile_arch_exit();
return err;
}
static int oprofile_hwsampler_init(struct oprofile_operations *ops)
{
if (hwsampler_setup())
return -ENODEV;
/*
* create hwsampler files only if hwsampler_setup() succeeds.
*/
oprofile_min_interval = hwsampler_query_min_interval();
if (oprofile_min_interval == 0)
return -ENODEV;
oprofile_max_interval = hwsampler_query_max_interval();
if (oprofile_max_interval == 0)
return -ENODEV;
if (oprofile_timer_init(ops))
return -ENODEV;
printk(KERN_INFO "oprofile: using hardware sampling\n");
memcpy(&timer_ops, ops, sizeof(timer_ops));
ops->start = oprofile_hwsampler_start;
ops->stop = oprofile_hwsampler_stop;
ops->create_files = oprofile_create_hwsampling_files;
return 0;
}
static int oprofile_hwsampler_init(struct oprofile_operations *ops)
{
/*
* Initialize the timer mode infrastructure as well in order
* to be able to switch back dynamically. oprofile_timer_init
* is not supposed to fail.
*/
if (oprofile_timer_init(ops))
BUG();
memcpy(&timer_ops, ops, sizeof(timer_ops));
ops->create_files = oprofile_create_hwsampling_files;
/*
* If the user space tools do not support newer cpu types,
* the force_cpu_type module parameter
* can be used to always return \"timer\" as cpu type.
*/
if (force_cpu_type != timer) {
struct cpuid id;
get_cpu_id (&id);
switch (id.machine) {
case 0x2097: case 0x2098: ops->cpu_type = "s390/z10"; break;
case 0x2817: case 0x2818: ops->cpu_type = "s390/z196"; break;
case 0x2827: case 0x2828: ops->cpu_type = "s390/zEC12"; break;
default: return -ENODEV;
}
}
if (hwsampler_setup())
return -ENODEV;
/*
* Query the range for the sampling interval from the
* hardware.
*/
oprofile_min_interval = hwsampler_query_min_interval();
if (oprofile_min_interval == 0)
return -ENODEV;
oprofile_max_interval = hwsampler_query_max_interval();
if (oprofile_max_interval == 0)
return -ENODEV;
/* The initial value should be sane */
if (oprofile_hw_interval < oprofile_min_interval)
oprofile_hw_interval = oprofile_min_interval;
if (oprofile_hw_interval > oprofile_max_interval)
oprofile_hw_interval = oprofile_max_interval;
printk(KERN_INFO "oprofile: System z hardware sampling "
"facility found.\n");
ops->start = oprofile_hwsampler_start;
ops->stop = oprofile_hwsampler_stop;
return 0;
}
static int __init oprofile_init(void)
{
int err;
err = oprofile_arch_init(&oprofile_ops);
if (err < 0 || timer) {
printk(KERN_INFO "oprofile: using timer interrupt.\n");
err = oprofile_timer_init(&oprofile_ops);
if (err)
return err;
}
return oprofilefs_register();
}
