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![Viresh Kumar](/assets/img/avatar_default.png)
"opp-hz" property is optional for power domains now and we shouldn't error out if it is missing for power domains. This patch creates two new routines, _get_opp_count() and _opp_is_duplicate(), by separating existing code from their parent functions. Also skip duplicate OPP check for power domain OPPs as they may not have any the "opp-hz" field, but a platform specific performance state binding to uniquely identify OPP nodes. By default the debugfs OPP nodes are named using the "rate" value, but that isn't possible for the power domain OPP nodes and hence they use the index of the OPP node in the OPP node list instead. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
262 lines
6.3 KiB
C
262 lines
6.3 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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unsigned long id;
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char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
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/*
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* Get directory name for OPP.
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*
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* - Normally rate is unique to each OPP, use it to get unique opp-name.
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* - For some devices rate isn't available, use index instead.
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*/
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if (likely(opp->rate))
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id = opp->rate;
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else
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id = _get_opp_count(opp_table);
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snprintf(name, sizeof(name), "opp:%lu", id);
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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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