linux/drivers/opp/debugfs.c
Viresh Kumar 009acd196f PM / OPP: Support updating performance state of device's power domain
The genpd framework now provides an API to request device's power
domain to update its performance state.  Use that interface from the
OPP core for devices whose power domains support performance states.

Note that this commit doesn't add any mechanism by which performance
states are made available to the OPP core. That would be done by a
later commit.

Note that the current implementation is restricted to the case where
the device doesn't have separate regulators for itself. We shouldn't
over engineer the code before we have real use case for them. We can
always come back and add more code to support such cases later on.

Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-10-14 00:54:40 +02:00

252 lines
6.1 KiB
C

/*
* Generic OPP debugfs interface
*
* Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/err.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 bool 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[15];
snprintf(name, sizeof(name), "supply-%d", i);
/* Create per-opp directory */
d = debugfs_create_dir(name, pdentry);
if (!d)
return false;
if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d,
&opp->supplies[i].u_volt))
return false;
if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d,
&opp->supplies[i].u_volt_min))
return false;
if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d,
&opp->supplies[i].u_volt_max))
return false;
if (!debugfs_create_ulong("u_amp", S_IRUGO, d,
&opp->supplies[i].u_amp))
return false;
}
return true;
}
int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
{
struct dentry *pdentry = opp_table->dentry;
struct dentry *d;
char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
/* Rate is unique to each OPP, use it to give opp-name */
snprintf(name, sizeof(name), "opp:%lu", opp->rate);
/* Create per-opp directory */
d = debugfs_create_dir(name, pdentry);
if (!d)
return -ENOMEM;
if (!debugfs_create_bool("available", S_IRUGO, d, &opp->available))
return -ENOMEM;
if (!debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic))
return -ENOMEM;
if (!debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo))
return -ENOMEM;
if (!debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend))
return -ENOMEM;
if (!debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate))
return -ENOMEM;
if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate))
return -ENOMEM;
if (!opp_debug_create_supplies(opp, opp_table, d))
return -ENOMEM;
if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
&opp->clock_latency_ns))
return -ENOMEM;
opp->dentry = d;
return 0;
}
static int 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);
if (!d) {
dev_err(dev, "%s: Failed to create debugfs dir\n", __func__);
return -ENOMEM;
}
opp_dev->dentry = d;
opp_table->dentry = d;
return 0;
}
static int opp_list_debug_create_link(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
const struct device *dev = opp_dev->dev;
char name[NAME_MAX];
struct dentry *d;
opp_set_dev_name(opp_dev->dev, name);
/* Create device specific directory link */
d = debugfs_create_symlink(name, rootdir, opp_table->dentry_name);
if (!d) {
dev_err(dev, "%s: Failed to create link\n", __func__);
return -ENOMEM;
}
opp_dev->dentry = d;
return 0;
}
/**
* 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.
*
* Return: 0 on success, otherwise negative error.
*/
int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
{
if (!rootdir) {
pr_debug("%s: Uninitialized rootdir\n", __func__);
return -EINVAL;
}
if (opp_table->dentry)
return opp_list_debug_create_link(opp_dev, opp_table);
return 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;
const struct device *dev;
struct dentry *dentry;
/* Look for next opp-dev */
list_for_each_entry(new_dev, &opp_table->dev_list, node)
if (new_dev != opp_dev)
break;
/* 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 (!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);
if (!rootdir) {
pr_err("%s: Failed to create root directory\n", __func__);
return -ENOMEM;
}
return 0;
}
core_initcall(opp_debug_init);