static int
read_proc_dpm_opt_stats(char *page, char **start, off_t offset,
int count, int *eof, void *data)
{
int len = 0;
struct dpm_opt *opt;
struct list_head *p;
dpm_md_time_t total_time;
if (dpm_lock_interruptible())
return -ERESTARTSYS;
if (!dpm_enabled) {
dpm_unlock();
len += sprintf(page + len, "DPM IS DISABLED\n");
*eof = 1;
return len;
}
for (p = dpm_opts.next; p != &dpm_opts; p = p->next) {
opt = list_entry(p, struct dpm_opt, list);
len += sprintf(page + len, "%s", opt->name);
total_time = opt->stats.total_time;
if (opt == dpm_active_opt)
total_time += dpm_md_time() - opt->stats.start_time;
len += sprintf_u64(page + len, 0, " ", opt->stats.total_time);
len += sprintf_u64(page + len, 0, " ", opt->stats.count);
len += sprintf(page + len, "\n");
}
dpm_unlock();
*eof = 1;
return len;
}
static void
latency_stats(struct dpm_idle_parms *idle_parms)
{
u32 latency;
if (idle_parms->entry_time && idle_parms->exit_time) {
latency = dpm_md_time() - idle_parms->exit_time;
if (latency > idle_lats.max_latency_to_idle_task)
idle_lats.max_latency_to_idle_task = latency;
}
if (idle_parms->entry_time) {
latency = idle_parms->entry_time - idle_parms->start_time;
if (latency > idle_lats.max_latency_to_idle)
idle_lats.max_latency_to_idle = latency;
if (idle_parms->irq_check_time) {
latency = idle_parms->entry_time -
idle_parms->irq_check_time;
if (latency > idle_lats.max_cs_to_idle)
idle_lats.max_cs_to_idle = latency;
}
}
}
static void
preempt_idle(struct dpm_idle_parms *idle_parms)
{
incr_stat(idle_preemptions);
stat_entry_time(idle_parms, dpm_md_time());
stat_exit_time(idle_parms, 0);
}
static void
stat_start_time(struct dpm_idle_parms *idle_parms)
{
idle_parms->entry_time = 0;
idle_parms->exit_time = 0;
idle_parms->start_time = dpm_md_time();
idle_parms->irq_check_time = 0;
}
static void
full_idle(struct dpm_idle_parms *idle_parms,
struct dpm_opt *idle_task_opt, struct dpm_opt *idle_opt)
{
dpm_fscaler idle_fscaler, idle_task_fscaler;
if (fscaleable(&idle_task_opt->md_opt, &idle_opt->md_opt) &&
fscaleable(&idle_opt->md_opt, &idle_task_opt->md_opt)) {
/* In case we've spent so much time getting ready that an
interrupt is already pending we can preempt the idle. */
idle_fscaler = compute_fscaler(&idle_task_opt->md_opt,
&idle_opt->md_opt);
idle_task_fscaler = compute_fscaler(&idle_opt->md_opt,
&idle_task_opt->md_opt);
if (return_from_idle_immediate()) {
preempt_idle(idle_parms);
return;
}
stat_irq_check_time(idle_parms, dpm_md_time());
dpm_quick_enter_state(DPM_IDLE_STATE);
#ifdef CONFIG_DPM_OPT_STATS
dpm_update_stats(&idle_opt->stats, &idle_task_opt->stats);
#endif
idle_fscaler(&idle_opt->md_opt.regs);
if (basic_idle(idle_parms))
incr_stat(full_idles);
else
incr_stat(idle_preemptions);
idle_task_fscaler(&idle_task_opt->md_opt.regs);
dpm_quick_enter_state(DPM_IDLE_TASK_STATE);
#ifdef CONFIG_DPM_OPT_STATS
dpm_update_stats(&idle_task_opt->stats, &idle_opt->stats);
#endif
} else {
/* If you're concerned at all about interrupt latency you don't
want to be here. The current policy requires a voltage
scale or some other long-latency operation to move between
idle and idle-task. */
dpm_set_os(DPM_IDLE_STATE);
if (basic_idle(idle_parms))
incr_stat(inefficient_idles);
else
incr_stat(idle_preemptions);
dpm_set_os(DPM_IDLE_TASK_STATE);
}
}