// SPDX-License-Identifier: GPL-2.0-only /* * Generic OPP debugfs interface * * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org> */ #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 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[15]; 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); } } 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, use index instead. */ if (likely(opp->rate)) id = opp->rate; 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("performance_state", S_IRUGO, d, &opp->pstate); debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate); debugfs_create_ulong("clock_latency_ns", S_IRUGO, d, &opp->clock_latency_ns); opp_debug_create_supplies(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; 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); return 0; } core_initcall(opp_debug_init);