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249 lines
6.3 KiB
249 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Generic OPP debugfs interface |
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* |
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* Copyright (C) 2015-2016 Viresh Kumar <[email protected]> |
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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 ssize_t bw_name_read(struct file *fp, char __user *userbuf, |
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size_t count, loff_t *ppos) |
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{ |
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struct icc_path *path = fp->private_data; |
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char buf[64]; |
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int i; |
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i = scnprintf(buf, sizeof(buf), "%.62s\n", icc_get_name(path)); |
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return simple_read_from_buffer(userbuf, count, ppos, buf, i); |
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} |
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static const struct file_operations bw_name_fops = { |
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.open = simple_open, |
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.read = bw_name_read, |
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.llseek = default_llseek, |
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}; |
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static void opp_debug_create_bw(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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char name[11]; |
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int i; |
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for (i = 0; i < opp_table->path_count; i++) { |
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snprintf(name, sizeof(name), "icc-path-%.1d", i); |
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/* Create per-path directory */ |
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d = debugfs_create_dir(name, pdentry); |
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debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i], |
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&bw_name_fops); |
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debugfs_create_u32("peak_bw", S_IRUGO, d, |
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&opp->bandwidth[i].peak); |
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debugfs_create_u32("avg_bw", S_IRUGO, d, |
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&opp->bandwidth[i].avg); |
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} |
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} |
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static void 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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debugfs_create_ulong("u_volt_target", S_IRUGO, d, |
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&opp->supplies[i].u_volt); |
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debugfs_create_ulong("u_volt_min", S_IRUGO, d, |
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&opp->supplies[i].u_volt_min); |
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debugfs_create_ulong("u_volt_max", S_IRUGO, d, |
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&opp->supplies[i].u_volt_max); |
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debugfs_create_ulong("u_amp", S_IRUGO, d, |
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&opp->supplies[i].u_amp); |
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} |
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} |
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void 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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debugfs_create_bool("available", S_IRUGO, d, &opp->available); |
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debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic); |
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debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo); |
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debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend); |
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debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate); |
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debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate); |
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debugfs_create_ulong("clock_latency_ns", S_IRUGO, d, |
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&opp->clock_latency_ns); |
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opp_debug_create_supplies(opp, opp_table, d); |
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opp_debug_create_bw(opp, opp_table, d); |
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opp->dentry = d; |
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} |
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static void 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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opp_dev->dentry = d; |
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opp_table->dentry = d; |
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} |
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static void 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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char name[NAME_MAX]; |
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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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opp_dev->dentry = debugfs_create_symlink(name, rootdir, |
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opp_table->dentry_name); |
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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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void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table) |
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{ |
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if (opp_table->dentry) |
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opp_list_debug_create_link(opp_dev, opp_table); |
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else |
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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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return 0; |
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} |
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core_initcall(opp_debug_init);
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