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-rw-r--r--drivers/opp/debugfs.c279
1 files changed, 279 insertions, 0 deletions
diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
new file mode 100644
index 0000000000..17543c0aa5
--- /dev/null
+++ b/drivers/opp/debugfs.c
@@ -0,0 +1,279 @@
+// 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;
+ char buf[64];
+ int i;
+
+ i = scnprintf(buf, sizeof(buf), "%.62s\n", icc_get_name(path));
+
+ 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[11];
+ int i;
+
+ for (i = 0; i < opp_table->path_count; i++) {
+ snprintf(name, sizeof(name), "icc-path-%.1d", 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[12];
+ 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[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);
+
+ 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;
+ 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 or there are multiple, use
+ * index instead for them.
+ */
+ if (likely(opp_table->clk_count == 1 && opp->rates[0]))
+ id = opp->rates[0];
+ 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("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;
+ struct dentry *dentry;
+
+ /* 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);
+
+ dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
+ opp_table->dentry_name);
+ if (IS_ERR(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);