cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

debugfs.c (6792B)


      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Generic OPP debugfs interface
      4 *
      5 * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
      6 */
      7
      8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
      9
     10#include <linux/debugfs.h>
     11#include <linux/device.h>
     12#include <linux/err.h>
     13#include <linux/of.h>
     14#include <linux/init.h>
     15#include <linux/limits.h>
     16#include <linux/slab.h>
     17
     18#include "opp.h"
     19
     20static struct dentry *rootdir;
     21
     22static void opp_set_dev_name(const struct device *dev, char *name)
     23{
     24	if (dev->parent)
     25		snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
     26			 dev_name(dev));
     27	else
     28		snprintf(name, NAME_MAX, "%s", dev_name(dev));
     29}
     30
     31void opp_debug_remove_one(struct dev_pm_opp *opp)
     32{
     33	debugfs_remove_recursive(opp->dentry);
     34}
     35
     36static ssize_t bw_name_read(struct file *fp, char __user *userbuf,
     37			    size_t count, loff_t *ppos)
     38{
     39	struct icc_path *path = fp->private_data;
     40	char buf[64];
     41	int i;
     42
     43	i = scnprintf(buf, sizeof(buf), "%.62s\n", icc_get_name(path));
     44
     45	return simple_read_from_buffer(userbuf, count, ppos, buf, i);
     46}
     47
     48static const struct file_operations bw_name_fops = {
     49	.open = simple_open,
     50	.read = bw_name_read,
     51	.llseek = default_llseek,
     52};
     53
     54static void opp_debug_create_bw(struct dev_pm_opp *opp,
     55				struct opp_table *opp_table,
     56				struct dentry *pdentry)
     57{
     58	struct dentry *d;
     59	char name[11];
     60	int i;
     61
     62	for (i = 0; i < opp_table->path_count; i++) {
     63		snprintf(name, sizeof(name), "icc-path-%.1d", i);
     64
     65		/* Create per-path directory */
     66		d = debugfs_create_dir(name, pdentry);
     67
     68		debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i],
     69				    &bw_name_fops);
     70		debugfs_create_u32("peak_bw", S_IRUGO, d,
     71				   &opp->bandwidth[i].peak);
     72		debugfs_create_u32("avg_bw", S_IRUGO, d,
     73				   &opp->bandwidth[i].avg);
     74	}
     75}
     76
     77static void opp_debug_create_supplies(struct dev_pm_opp *opp,
     78				      struct opp_table *opp_table,
     79				      struct dentry *pdentry)
     80{
     81	struct dentry *d;
     82	int i;
     83
     84	for (i = 0; i < opp_table->regulator_count; i++) {
     85		char name[15];
     86
     87		snprintf(name, sizeof(name), "supply-%d", i);
     88
     89		/* Create per-opp directory */
     90		d = debugfs_create_dir(name, pdentry);
     91
     92		debugfs_create_ulong("u_volt_target", S_IRUGO, d,
     93				     &opp->supplies[i].u_volt);
     94
     95		debugfs_create_ulong("u_volt_min", S_IRUGO, d,
     96				     &opp->supplies[i].u_volt_min);
     97
     98		debugfs_create_ulong("u_volt_max", S_IRUGO, d,
     99				     &opp->supplies[i].u_volt_max);
    100
    101		debugfs_create_ulong("u_amp", S_IRUGO, d,
    102				     &opp->supplies[i].u_amp);
    103
    104		debugfs_create_ulong("u_watt", S_IRUGO, d,
    105				     &opp->supplies[i].u_watt);
    106	}
    107}
    108
    109void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
    110{
    111	struct dentry *pdentry = opp_table->dentry;
    112	struct dentry *d;
    113	unsigned long id;
    114	char name[25];	/* 20 chars for 64 bit value + 5 (opp:\0) */
    115
    116	/*
    117	 * Get directory name for OPP.
    118	 *
    119	 * - Normally rate is unique to each OPP, use it to get unique opp-name.
    120	 * - For some devices rate isn't available, use index instead.
    121	 */
    122	if (likely(opp->rate))
    123		id = opp->rate;
    124	else
    125		id = _get_opp_count(opp_table);
    126
    127	snprintf(name, sizeof(name), "opp:%lu", id);
    128
    129	/* Create per-opp directory */
    130	d = debugfs_create_dir(name, pdentry);
    131
    132	debugfs_create_bool("available", S_IRUGO, d, &opp->available);
    133	debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic);
    134	debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo);
    135	debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend);
    136	debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate);
    137	debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate);
    138	debugfs_create_u32("level", S_IRUGO, d, &opp->level);
    139	debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
    140			     &opp->clock_latency_ns);
    141
    142	opp->of_name = of_node_full_name(opp->np);
    143	debugfs_create_str("of_name", S_IRUGO, d, (char **)&opp->of_name);
    144
    145	opp_debug_create_supplies(opp, opp_table, d);
    146	opp_debug_create_bw(opp, opp_table, d);
    147
    148	opp->dentry = d;
    149}
    150
    151static void opp_list_debug_create_dir(struct opp_device *opp_dev,
    152				      struct opp_table *opp_table)
    153{
    154	const struct device *dev = opp_dev->dev;
    155	struct dentry *d;
    156
    157	opp_set_dev_name(dev, opp_table->dentry_name);
    158
    159	/* Create device specific directory */
    160	d = debugfs_create_dir(opp_table->dentry_name, rootdir);
    161
    162	opp_dev->dentry = d;
    163	opp_table->dentry = d;
    164}
    165
    166static void opp_list_debug_create_link(struct opp_device *opp_dev,
    167				       struct opp_table *opp_table)
    168{
    169	char name[NAME_MAX];
    170
    171	opp_set_dev_name(opp_dev->dev, name);
    172
    173	/* Create device specific directory link */
    174	opp_dev->dentry = debugfs_create_symlink(name, rootdir,
    175						 opp_table->dentry_name);
    176}
    177
    178/**
    179 * opp_debug_register - add a device opp node to the debugfs 'opp' directory
    180 * @opp_dev: opp-dev pointer for device
    181 * @opp_table: the device-opp being added
    182 *
    183 * Dynamically adds device specific directory in debugfs 'opp' directory. If the
    184 * device-opp is shared with other devices, then links will be created for all
    185 * devices except the first.
    186 */
    187void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
    188{
    189	if (opp_table->dentry)
    190		opp_list_debug_create_link(opp_dev, opp_table);
    191	else
    192		opp_list_debug_create_dir(opp_dev, opp_table);
    193}
    194
    195static void opp_migrate_dentry(struct opp_device *opp_dev,
    196			       struct opp_table *opp_table)
    197{
    198	struct opp_device *new_dev = NULL, *iter;
    199	const struct device *dev;
    200	struct dentry *dentry;
    201
    202	/* Look for next opp-dev */
    203	list_for_each_entry(iter, &opp_table->dev_list, node)
    204		if (iter != opp_dev) {
    205			new_dev = iter;
    206			break;
    207		}
    208
    209	BUG_ON(!new_dev);
    210
    211	/* new_dev is guaranteed to be valid here */
    212	dev = new_dev->dev;
    213	debugfs_remove_recursive(new_dev->dentry);
    214
    215	opp_set_dev_name(dev, opp_table->dentry_name);
    216
    217	dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
    218				opp_table->dentry_name);
    219	if (!dentry) {
    220		dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
    221			__func__, dev_name(opp_dev->dev), dev_name(dev));
    222		return;
    223	}
    224
    225	new_dev->dentry = dentry;
    226	opp_table->dentry = dentry;
    227}
    228
    229/**
    230 * opp_debug_unregister - remove a device opp node from debugfs opp directory
    231 * @opp_dev: opp-dev pointer for device
    232 * @opp_table: the device-opp being removed
    233 *
    234 * Dynamically removes device specific directory from debugfs 'opp' directory.
    235 */
    236void opp_debug_unregister(struct opp_device *opp_dev,
    237			  struct opp_table *opp_table)
    238{
    239	if (opp_dev->dentry == opp_table->dentry) {
    240		/* Move the real dentry object under another device */
    241		if (!list_is_singular(&opp_table->dev_list)) {
    242			opp_migrate_dentry(opp_dev, opp_table);
    243			goto out;
    244		}
    245		opp_table->dentry = NULL;
    246	}
    247
    248	debugfs_remove_recursive(opp_dev->dentry);
    249
    250out:
    251	opp_dev->dentry = NULL;
    252}
    253
    254static int __init opp_debug_init(void)
    255{
    256	/* Create /sys/kernel/debug/opp directory */
    257	rootdir = debugfs_create_dir("opp", NULL);
    258
    259	return 0;
    260}
    261core_initcall(opp_debug_init);