252 lines
6.1 KiB
C
252 lines
6.1 KiB
C
/*
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* Generic OPP debugfs interface
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*
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* Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/limits.h>
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#include <linux/slab.h>
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#include "opp.h"
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static struct dentry *rootdir;
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static void opp_set_dev_name(const struct device *dev, char *name)
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{
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if (dev->parent)
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snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
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dev_name(dev));
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else
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snprintf(name, NAME_MAX, "%s", dev_name(dev));
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}
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void opp_debug_remove_one(struct dev_pm_opp *opp)
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{
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debugfs_remove_recursive(opp->dentry);
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}
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static bool opp_debug_create_supplies(struct dev_pm_opp *opp,
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struct opp_table *opp_table,
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struct dentry *pdentry)
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{
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struct dentry *d;
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int i;
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for (i = 0; i < opp_table->regulator_count; i++) {
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char name[15];
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snprintf(name, sizeof(name), "supply-%d", i);
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/* Create per-opp directory */
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d = debugfs_create_dir(name, pdentry);
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if (!d)
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return false;
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if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d,
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&opp->supplies[i].u_volt))
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return false;
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if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d,
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&opp->supplies[i].u_volt_min))
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return false;
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if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d,
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&opp->supplies[i].u_volt_max))
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return false;
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if (!debugfs_create_ulong("u_amp", S_IRUGO, d,
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&opp->supplies[i].u_amp))
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return false;
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}
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return true;
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}
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int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
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{
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struct dentry *pdentry = opp_table->dentry;
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struct dentry *d;
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char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
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/* Rate is unique to each OPP, use it to give opp-name */
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snprintf(name, sizeof(name), "opp:%lu", opp->rate);
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/* Create per-opp directory */
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d = debugfs_create_dir(name, pdentry);
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if (!d)
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return -ENOMEM;
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if (!debugfs_create_bool("available", S_IRUGO, d, &opp->available))
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return -ENOMEM;
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if (!debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic))
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return -ENOMEM;
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if (!debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo))
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return -ENOMEM;
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if (!debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend))
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return -ENOMEM;
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if (!debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate))
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return -ENOMEM;
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if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate))
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return -ENOMEM;
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if (!opp_debug_create_supplies(opp, opp_table, d))
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return -ENOMEM;
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if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
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&opp->clock_latency_ns))
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return -ENOMEM;
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opp->dentry = d;
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return 0;
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}
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static int opp_list_debug_create_dir(struct opp_device *opp_dev,
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struct opp_table *opp_table)
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{
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const struct device *dev = opp_dev->dev;
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struct dentry *d;
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opp_set_dev_name(dev, opp_table->dentry_name);
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/* Create device specific directory */
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d = debugfs_create_dir(opp_table->dentry_name, rootdir);
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if (!d) {
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dev_err(dev, "%s: Failed to create debugfs dir\n", __func__);
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return -ENOMEM;
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}
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opp_dev->dentry = d;
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opp_table->dentry = d;
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return 0;
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}
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static int opp_list_debug_create_link(struct opp_device *opp_dev,
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struct opp_table *opp_table)
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{
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const struct device *dev = opp_dev->dev;
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char name[NAME_MAX];
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struct dentry *d;
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opp_set_dev_name(opp_dev->dev, name);
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/* Create device specific directory link */
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d = debugfs_create_symlink(name, rootdir, opp_table->dentry_name);
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if (!d) {
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dev_err(dev, "%s: Failed to create link\n", __func__);
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return -ENOMEM;
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}
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opp_dev->dentry = d;
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return 0;
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}
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/**
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* opp_debug_register - add a device opp node to the debugfs 'opp' directory
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* @opp_dev: opp-dev pointer for device
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* @opp_table: the device-opp being added
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*
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* Dynamically adds device specific directory in debugfs 'opp' directory. If the
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* device-opp is shared with other devices, then links will be created for all
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* devices except the first.
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*
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* Return: 0 on success, otherwise negative error.
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*/
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int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
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{
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if (!rootdir) {
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pr_debug("%s: Uninitialized rootdir\n", __func__);
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return -EINVAL;
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}
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if (opp_table->dentry)
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return opp_list_debug_create_link(opp_dev, opp_table);
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return opp_list_debug_create_dir(opp_dev, opp_table);
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}
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static void opp_migrate_dentry(struct opp_device *opp_dev,
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struct opp_table *opp_table)
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{
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struct opp_device *new_dev;
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const struct device *dev;
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struct dentry *dentry;
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/* Look for next opp-dev */
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list_for_each_entry(new_dev, &opp_table->dev_list, node)
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if (new_dev != opp_dev)
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break;
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/* new_dev is guaranteed to be valid here */
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dev = new_dev->dev;
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debugfs_remove_recursive(new_dev->dentry);
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opp_set_dev_name(dev, opp_table->dentry_name);
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dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
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opp_table->dentry_name);
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if (!dentry) {
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dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
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__func__, dev_name(opp_dev->dev), dev_name(dev));
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return;
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}
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new_dev->dentry = dentry;
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opp_table->dentry = dentry;
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}
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/**
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* opp_debug_unregister - remove a device opp node from debugfs opp directory
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* @opp_dev: opp-dev pointer for device
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* @opp_table: the device-opp being removed
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*
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* Dynamically removes device specific directory from debugfs 'opp' directory.
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*/
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void opp_debug_unregister(struct opp_device *opp_dev,
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struct opp_table *opp_table)
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{
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if (opp_dev->dentry == opp_table->dentry) {
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/* Move the real dentry object under another device */
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if (!list_is_singular(&opp_table->dev_list)) {
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opp_migrate_dentry(opp_dev, opp_table);
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goto out;
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}
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opp_table->dentry = NULL;
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}
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debugfs_remove_recursive(opp_dev->dentry);
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out:
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opp_dev->dentry = NULL;
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}
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static int __init opp_debug_init(void)
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{
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/* Create /sys/kernel/debug/opp directory */
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rootdir = debugfs_create_dir("opp", NULL);
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if (!rootdir) {
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pr_err("%s: Failed to create root directory\n", __func__);
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return -ENOMEM;
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}
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return 0;
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}
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core_initcall(opp_debug_init);
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