// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic OPP debugfs interface
*
* Copyright (C) 2015-2016 Viresh Kumar <[email protected]>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/limits.h>
#include <linux/slab.h>
#include "opp.h"
static struct dentry *rootdir;
static void opp_set_dev_name(const struct device *dev, char *name)
{
if (dev->parent)
snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
dev_name(dev));
else
snprintf(name, NAME_MAX, "%s", dev_name(dev));
}
void opp_debug_remove_one(struct dev_pm_opp *opp)
{
debugfs_remove_recursive(opp->dentry);
}
static ssize_t bw_name_read(struct file *fp, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct icc_path *path = fp->private_data;
const char *name = icc_get_name(path);
char buf[64];
int i = 0;
if (name)
i = scnprintf(buf, sizeof(buf), "%.62s\n", name);
return simple_read_from_buffer(userbuf, count, ppos, buf, i);
}
static const struct file_operations bw_name_fops = {
.open = simple_open,
.read = bw_name_read,
.llseek = default_llseek,
};
static void opp_debug_create_bw(struct dev_pm_opp *opp,
struct opp_table *opp_table,
struct dentry *pdentry)
{
struct dentry *d;
char name[] = "icc-path-XXXXXXXXXXX"; /* Integers can take 11 chars max */
int i;
for (i = 0; i < opp_table->path_count; i++) {
snprintf(name, sizeof(name), "icc-path-%d", i);
/* Create per-path directory */
d = debugfs_create_dir(name, pdentry);
debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i],
&bw_name_fops);
debugfs_create_u32("peak_bw", S_IRUGO, d,
&opp->bandwidth[i].peak);
debugfs_create_u32("avg_bw", S_IRUGO, d,
&opp->bandwidth[i].avg);
}
}
static void opp_debug_create_clks(struct dev_pm_opp *opp,
struct opp_table *opp_table,
struct dentry *pdentry)
{
char name[] = "rate_hz_XXXXXXXXXXX"; /* Integers can take 11 chars max */
int i;
if (opp_table->clk_count == 1) {
debugfs_create_ulong("rate_hz", S_IRUGO, pdentry, &opp->rates[0]);
return;
}
for (i = 0; i < opp_table->clk_count; i++) {
snprintf(name, sizeof(name), "rate_hz_%d", i);
debugfs_create_ulong(name, S_IRUGO, pdentry, &opp->rates[i]);
}
}
static void opp_debug_create_supplies(struct dev_pm_opp *opp,
struct opp_table *opp_table,
struct dentry *pdentry)
{
struct dentry *d;
int i;
for (i = 0; i < opp_table->regulator_count; i++) {
char name[] = "supply-XXXXXXXXXXX"; /* Integers can take 11 chars max */
snprintf(name, sizeof(name), "supply-%d", i);
/* Create per-opp directory */
d = debugfs_create_dir(name, pdentry);
debugfs_create_ulong("u_volt_target", S_IRUGO, d,
&opp->supplies[i].u_volt);
debugfs_create_ulong("u_volt_min", S_IRUGO, d,
&opp->supplies[i].u_volt_min);
debugfs_create_ulong("u_volt_max", S_IRUGO, d,
&opp->supplies[i].u_volt_max);
debugfs_create_ulong("u_amp", S_IRUGO, d,
&opp->supplies[i].u_amp);
debugfs_create_ulong("u_watt", S_IRUGO, d,
&opp->supplies[i].u_watt);
}
}
void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
{
struct dentry *pdentry = opp_table->dentry;
struct dentry *d;
unsigned long id;
char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
/*
* Get directory name for OPP.
*
* - Normally rate is unique to each OPP, use it to get unique opp-name.
* - For some devices rate isn't available or there are multiple, use
* index instead for them.
*/
if (likely(opp_table->clk_count == 1 && opp->rates[0]))
id = opp->rates[0];
else
id = _get_opp_count(opp_table);
snprintf(name, sizeof(name), "opp:%lu", id);
/* Create per-opp directory */
d = debugfs_create_dir(name, pdentry);
debugfs_create_bool("available", S_IRUGO, d, &opp->available);
debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic);
debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo);
debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend);
debugfs_create_u32("level", S_IRUGO, d, &opp->level);
debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
&opp->clock_latency_ns);
opp->of_name = of_node_full_name(opp->np);
debugfs_create_str("of_name", S_IRUGO, d, (char **)&opp->of_name);
opp_debug_create_clks(opp, opp_table, d);
opp_debug_create_supplies(opp, opp_table, d);
opp_debug_create_bw(opp, opp_table, d);
opp->dentry = d;
}
static void opp_list_debug_create_dir(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
const struct device *dev = opp_dev->dev;
struct dentry *d;
opp_set_dev_name(dev, opp_table->dentry_name);
/* Create device specific directory */
d = debugfs_create_dir(opp_table->dentry_name, rootdir);
opp_dev->dentry = d;
opp_table->dentry = d;
}
static void opp_list_debug_create_link(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
char name[NAME_MAX];
opp_set_dev_name(opp_dev->dev, name);
/* Create device specific directory link */
opp_dev->dentry = debugfs_create_symlink(name, rootdir,
opp_table->dentry_name);
}
/**
* opp_debug_register - add a device opp node to the debugfs 'opp' directory
* @opp_dev: opp-dev pointer for device
* @opp_table: the device-opp being added
*
* Dynamically adds device specific directory in debugfs 'opp' directory. If the
* device-opp is shared with other devices, then links will be created for all
* devices except the first.
*/
void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
{
if (opp_table->dentry)
opp_list_debug_create_link(opp_dev, opp_table);
else
opp_list_debug_create_dir(opp_dev, opp_table);
}
static void opp_migrate_dentry(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
struct opp_device *new_dev = NULL, *iter;
const struct device *dev;
struct dentry *dentry;
/* Look for next opp-dev */
list_for_each_entry(iter, &opp_table->dev_list, node)
if (iter != opp_dev) {
new_dev = iter;
break;
}
BUG_ON(!new_dev);
/* new_dev is guaranteed to be valid here */
dev = new_dev->dev;
debugfs_remove_recursive(new_dev->dentry);
opp_set_dev_name(dev, opp_table->dentry_name);
dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
opp_table->dentry_name);
if (IS_ERR(dentry)) {
dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
__func__, dev_name(opp_dev->dev), dev_name(dev));
return;
}
new_dev->dentry = dentry;
opp_table->dentry = dentry;
}
/**
* opp_debug_unregister - remove a device opp node from debugfs opp directory
* @opp_dev: opp-dev pointer for device
* @opp_table: the device-opp being removed
*
* Dynamically removes device specific directory from debugfs 'opp' directory.
*/
void opp_debug_unregister(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
if (opp_dev->dentry == opp_table->dentry) {
/* Move the real dentry object under another device */
if (!list_is_singular(&opp_table->dev_list)) {
opp_migrate_dentry(opp_dev, opp_table);
goto out;
}
opp_table->dentry = NULL;
}
debugfs_remove_recursive(opp_dev->dentry);
out:
opp_dev->dentry = NULL;
}
static int __init opp_debug_init(void)
{
/* Create /sys/kernel/debug/opp directory */
rootdir = debugfs_create_dir("opp", NULL);
return 0;
}
core_initcall(opp_debug_init);
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