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#include <linux/atomic.h>
#include <linux/cpuidle.h>
#include <linux/cpumask.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
static struct dentry *top_dentry;
static struct dentry *pred_dentry;
static struct dentry *under_dentry;
static struct dentry *over_dentry;
static struct dentry *good_dentry;
struct cpuidle_debugfs_stats {
struct dentry *under_dentry;
struct dentry *over_dentry;
struct dentry *good_dentry;
struct dentry *state_dentry;
unsigned long long good;
unsigned long long under;
unsigned long long over;
};
void cpuidle_debugfs_update(struct cpuidle_device *dev, int index)
{
struct cpuidle_driver *drv;
int diff = dev->last_residency;
drv = cpuidle_get_cpu_driver(dev);
if (!drv)
return;
/*
* If the residency time is:
*
* - more or equal than the target residency's selected idle
* state and less than the next one, the prediction is correct
*
* - less than the the target residency's selected idle state,
* the prediction is too late
*
* - more than the the next idle's target residency, the
* prediction is too early
*/
if (drv->states[index].target_residency <= diff) {
/* It is not the last state, check against the next one */
if (index < drv->state_count - 1) {
/* The prediction was shorter than expected */
if (drv->states[index + 1].target_residency <= diff)
dev->stats[index].under++;
else
dev->stats[index].good++;
} else {
dev->stats[index].good++;
}
} else {
dev->stats[index].over++;
}
}
void cpuidle_debugfs_remove_stats(struct cpuidle_debugfs_stats *stats)
{
debugfs_remove(stats->under_dentry);
debugfs_remove(stats->good_dentry);
debugfs_remove(stats->over_dentry);
}
void cpuidle_debugfs_remove_device(struct cpuidle_device *dev)
{
struct cpuidle_driver *drv;
int i;
drv = cpuidle_get_cpu_driver(dev);
if (!drv)
return;
for (i = 0; i < drv->state_count; i++) {
cpuidle_debugfs_remove_stats(&dev->stats[i]);
debugfs_remove(dev->stats[i].state_dentry);
}
debugfs_remove(dev->debug);
}
int cpuidle_debugfs_add_stats(struct cpuidle_debugfs_stats *stats)
{
int ret = -ENOMEM;
stats->good_dentry = debugfs_create_u64("good", 0444,
stats->state_dentry,
&stats->good);
if (!stats->good_dentry)
goto out;
stats->under_dentry = debugfs_create_u64("under", 0444,
stats->state_dentry,
&stats->under);
if (!stats->under_dentry)
goto out_remove_good;
stats->over_dentry = debugfs_create_u64("over", 0444,
stats->state_dentry,
&stats->over);
if (!stats->over_dentry)
goto out_remove_under;
ret = 0;
out:
return ret;
out_remove_good:
debugfs_remove(stats->good_dentry);
out_remove_under:
debugfs_remove(stats->under_dentry);
goto out;
}
int cpuidle_debugfs_add_device(struct cpuidle_device *dev)
{
struct cpuidle_driver *drv;
int ret = -ENOMEM;
int i;
char *namedir;
drv = cpuidle_get_cpu_driver(dev);
if (!drv)
return -EINVAL;
dev->stats = kzalloc(sizeof(*dev->stats) * CPUIDLE_STATE_MAX,
GFP_KERNEL);
if (!dev->stats)
return -ENOMEM;
namedir = kasprintf(GFP_KERNEL, "cpu%d", dev->cpu);
if (!namedir)
goto out_free_stats;
dev->debug = debugfs_create_dir(namedir, top_dentry);
kfree(namedir);
if (!dev->debug)
goto out_remove_dir;
for (i = 0; i < drv->state_count; i++) {
namedir = kasprintf(GFP_KERNEL, "state%d", i);
dev->stats[i].state_dentry = debugfs_create_dir(namedir,
dev->debug);
kfree(namedir);
if (!dev->stats[i].state_dentry)
goto out_remove_states;
ret = cpuidle_debugfs_add_stats(&dev->stats[i]);
if (ret) {
debugfs_remove(dev->stats[i].state_dentry);
goto out_remove_states;
}
}
ret = 0;
out:
return ret;
out_remove_states:
for (i--; i >= 0; i--) {
cpuidle_debugfs_remove_stats(&dev->stats[i]);
debugfs_remove(dev->stats[i].state_dentry);
}
out_remove_dir:
debugfs_remove(dev->debug);
out_free_stats:
kfree(dev->stats);
goto out;
}
static int cpuidle_debugfs_under_show(struct seq_file *s, void *data)
{
unsigned long long total = 0;
struct cpuidle_driver *drv;
struct cpuidle_device *dev;
int cpu, i;
for_each_possible_cpu(cpu) {
dev = per_cpu(cpuidle_devices, cpu);
if (!dev)
continue;
drv = cpuidle_get_cpu_driver(dev);
if (!drv)
return -EINVAL;
for (i = 0; i < drv->state_count; i++)
total += dev->stats[i].under;
}
seq_printf(s, "%llu\n", total);
return 0;
}
static int cpuidle_debugfs_over_show(struct seq_file *s, void *data)
{
unsigned long long total = 0;
struct cpuidle_driver *drv;
struct cpuidle_device *dev;
int cpu, i;
for_each_possible_cpu(cpu) {
dev = per_cpu(cpuidle_devices, cpu);
if (!dev)
continue;
drv = cpuidle_get_cpu_driver(dev);
if (!drv)
return -EINVAL;
for (i = 0; i < drv->state_count; i++)
total += dev->stats[i].over;
}
seq_printf(s, "%llu\n", total);
return 0;
}
static int cpuidle_debugfs_good_show(struct seq_file *s, void *data)
{
unsigned long long total = 0;
struct cpuidle_driver *drv;
struct cpuidle_device *dev;
int cpu, i;
for_each_possible_cpu(cpu) {
dev = per_cpu(cpuidle_devices, cpu);
if (!dev)
continue;
drv = cpuidle_get_cpu_driver(dev);
if (!drv)
return -EINVAL;
for (i = 0; i < drv->state_count; i++)
total += dev->stats[i].good;
}
seq_printf(s, "%llu\n", total);
return 0;
}
#define define_cpuidle_debugfs_open(name) \
static int cpuidle_debugfs_##name##_open(struct inode *inode, \
struct file *file) \
{ \
return single_open(file, cpuidle_debugfs_##name##_show, \
inode->i_private); \
}
define_cpuidle_debugfs_open(under);
define_cpuidle_debugfs_open(over);
define_cpuidle_debugfs_open(good);
#define define_cpuidle_debugfs_fops(name) \
static const struct file_operations cpuidle_debugfs_##name##_fops = { \
.open = cpuidle_debugfs_##name##_open, \
.read = seq_read, \
.llseek = seq_lseek, \
.release = single_release, \
}
define_cpuidle_debugfs_fops(under);
define_cpuidle_debugfs_fops(over);
define_cpuidle_debugfs_fops(good);
#define cpuidle_debugfs_fops(name) cpuidle_debugfs_##name##_fops
int cpuidle_debugfs_init(void)
{
top_dentry = debugfs_create_dir("cpuidle", NULL);
if (!top_dentry)
return -ENOMEM;
pred_dentry = debugfs_create_dir("predictions", top_dentry);
if (!pred_dentry)
goto out_top_dentry;
under_dentry = debugfs_create_file("under", 0444, pred_dentry, NULL,
&cpuidle_debugfs_fops(under));
if (!under_dentry)
goto out_pred_dentry;
over_dentry = debugfs_create_file("over", 0444, pred_dentry, NULL,
&cpuidle_debugfs_fops(over));
if (!over_dentry)
goto out_under_dentry;
good_dentry = debugfs_create_file("good", 0444, pred_dentry, NULL,
&cpuidle_debugfs_fops(good));
if (!good_dentry)
goto out_over_dentry;
return 0;
out_over_dentry:
debugfs_remove(over_dentry);
out_under_dentry:
debugfs_remove(under_dentry);
out_pred_dentry:
debugfs_remove(pred_dentry);
out_top_dentry:
debugfs_remove(top_dentry);
return -ENOMEM;
}
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