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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282// 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/of.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 ssize_t bw_name_read(struct file *fp, char __user *userbuf, size_t count, loff_t *ppos){ struct icc_path *path = fp->private_data; const char *name = icc_get_name(path); char buf[64]; int i = 0;
if (name) i = scnprintf(buf, sizeof(buf), "%.62s\n", name);
return simple_read_from_buffer(userbuf, count, ppos, buf, i);}
static const struct file_operations bw_name_fops = { .open = simple_open, .read = bw_name_read, .llseek = default_llseek,};
static void opp_debug_create_bw(struct dev_pm_opp *opp, struct opp_table *opp_table, struct dentry *pdentry){ struct dentry *d; char name[] = "icc-path-XXXXXXXXXXX"; /* Integers can take 11 chars max */ int i;
for (i = 0; i < opp_table->path_count; i++) { snprintf(name, sizeof(name), "icc-path-%d", i);
/* Create per-path directory */ d = debugfs_create_dir(name, pdentry);
debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i], &bw_name_fops); debugfs_create_u32("peak_bw", S_IRUGO, d, &opp->bandwidth[i].peak); debugfs_create_u32("avg_bw", S_IRUGO, d, &opp->bandwidth[i].avg); }}
static void opp_debug_create_clks(struct dev_pm_opp *opp, struct opp_table *opp_table, struct dentry *pdentry){ char name[] = "rate_hz_XXXXXXXXXXX"; /* Integers can take 11 chars max */ int i;
if (opp_table->clk_count == 1) { debugfs_create_ulong("rate_hz", S_IRUGO, pdentry, &opp->rates[0]); return; }
for (i = 0; i < opp_table->clk_count; i++) { snprintf(name, sizeof(name), "rate_hz_%d", i); debugfs_create_ulong(name, S_IRUGO, pdentry, &opp->rates[i]); }}
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[] = "supply-XXXXXXXXXXX"; /* Integers can take 11 chars max */
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);
debugfs_create_ulong("u_watt", S_IRUGO, d, &opp->supplies[i].u_watt); }}
void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table){ struct dentry *pdentry = opp_table->dentry; struct dentry *d; char name[36]; /* "opp:"(4) + u64(20) + "-" (1) + u32(10) + NULL(1) */
/* * Get directory name for OPP. * * - Normally rate is unique to each OPP, use it to get unique opp-name, * together with performance level if available. * - For some devices rate isn't available or there are multiple, use * index instead for them. */ if (likely(opp_table->clk_count == 1 && opp->rates[0])) { if (opp->level == OPP_LEVEL_UNSET) snprintf(name, sizeof(name), "opp:%lu", opp->rates[0]); else snprintf(name, sizeof(name), "opp:%lu-%u", opp->rates[0], opp->level); } else { snprintf(name, sizeof(name), "opp:%u", _get_opp_count(opp_table)); }
/* 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("level", S_IRUGO, d, &opp->level); debugfs_create_ulong("clock_latency_ns", S_IRUGO, d, &opp->clock_latency_ns);
opp->of_name = of_node_full_name(opp->np); debugfs_create_str("of_name", S_IRUGO, d, (char **)&opp->of_name);
opp_debug_create_clks(opp, opp_table, d); opp_debug_create_supplies(opp, opp_table, d); opp_debug_create_bw(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 = NULL, *iter; const struct device *dev; int err;
/* Look for next opp-dev */ list_for_each_entry(iter, &opp_table->dev_list, node) if (iter != opp_dev) { new_dev = iter; break; }
BUG_ON(!new_dev);
/* 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);
err = debugfs_change_name(opp_dev->dentry, "%s", opp_table->dentry_name); if (err) { 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 = opp_table->dentry = opp_dev->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);