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Diffstat (limited to 'drivers/opp')
-rw-r--r--drivers/opp/core.c22
-rw-r--r--drivers/opp/debugfs.c110
-rw-r--r--drivers/opp/of.c99
-rw-r--r--drivers/opp/opp.h15
4 files changed, 142 insertions, 104 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index e06a0ab05ad6..d7f97167cac3 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -551,9 +551,8 @@ static int _set_opp_voltage(struct device *dev, struct regulator *reg,
return ret;
}
-static inline int
-_generic_set_opp_clk_only(struct device *dev, struct clk *clk,
- unsigned long old_freq, unsigned long freq)
+static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk,
+ unsigned long freq)
{
int ret;
@@ -590,7 +589,7 @@ static int _generic_set_opp_regulator(const struct opp_table *opp_table,
}
/* Change frequency */
- ret = _generic_set_opp_clk_only(dev, opp_table->clk, old_freq, freq);
+ ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq);
if (ret)
goto restore_voltage;
@@ -604,7 +603,7 @@ static int _generic_set_opp_regulator(const struct opp_table *opp_table,
return 0;
restore_freq:
- if (_generic_set_opp_clk_only(dev, opp_table->clk, freq, old_freq))
+ if (_generic_set_opp_clk_only(dev, opp_table->clk, old_freq))
dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n",
__func__, old_freq);
restore_voltage:
@@ -777,7 +776,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
opp->supplies);
} else {
/* Only frequency scaling */
- ret = _generic_set_opp_clk_only(dev, clk, old_freq, freq);
+ ret = _generic_set_opp_clk_only(dev, clk, freq);
}
/* Scaling down? Configure required OPPs after frequency */
@@ -811,7 +810,6 @@ static struct opp_device *_add_opp_dev_unlocked(const struct device *dev,
struct opp_table *opp_table)
{
struct opp_device *opp_dev;
- int ret;
opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL);
if (!opp_dev)
@@ -823,10 +821,7 @@ static struct opp_device *_add_opp_dev_unlocked(const struct device *dev,
list_add(&opp_dev->node, &opp_table->dev_list);
/* Create debugfs entries for the opp_table */
- ret = opp_debug_register(opp_dev, opp_table);
- if (ret)
- dev_err(dev, "%s: Failed to register opp debugfs (%d)\n",
- __func__, ret);
+ opp_debug_register(opp_dev, opp_table);
return opp_dev;
}
@@ -1247,10 +1242,7 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
new_opp->opp_table = opp_table;
kref_init(&new_opp->kref);
- ret = opp_debug_create_one(new_opp, opp_table);
- if (ret)
- dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n",
- __func__, ret);
+ opp_debug_create_one(new_opp, opp_table);
if (!_opp_supported_by_regulators(new_opp, opp_table)) {
new_opp->available = false;
diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
index e6828e5f81b0..a1c57fe14de4 100644
--- a/drivers/opp/debugfs.c
+++ b/drivers/opp/debugfs.c
@@ -35,7 +35,7 @@ void opp_debug_remove_one(struct dev_pm_opp *opp)
debugfs_remove_recursive(opp->dentry);
}
-static bool opp_debug_create_supplies(struct dev_pm_opp *opp,
+static void opp_debug_create_supplies(struct dev_pm_opp *opp,
struct opp_table *opp_table,
struct dentry *pdentry)
{
@@ -50,30 +50,21 @@ static bool opp_debug_create_supplies(struct dev_pm_opp *opp,
/* Create per-opp directory */
d = debugfs_create_dir(name, pdentry);
- if (!d)
- return false;
+ debugfs_create_ulong("u_volt_target", S_IRUGO, d,
+ &opp->supplies[i].u_volt);
- if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d,
- &opp->supplies[i].u_volt))
- return false;
+ debugfs_create_ulong("u_volt_min", S_IRUGO, d,
+ &opp->supplies[i].u_volt_min);
- if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d,
- &opp->supplies[i].u_volt_min))
- return false;
+ debugfs_create_ulong("u_volt_max", S_IRUGO, d,
+ &opp->supplies[i].u_volt_max);
- if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d,
- &opp->supplies[i].u_volt_max))
- return false;
-
- if (!debugfs_create_ulong("u_amp", S_IRUGO, d,
- &opp->supplies[i].u_amp))
- return false;
+ debugfs_create_ulong("u_amp", S_IRUGO, d,
+ &opp->supplies[i].u_amp);
}
-
- return true;
}
-int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
+void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
{
struct dentry *pdentry = opp_table->dentry;
struct dentry *d;
@@ -95,40 +86,23 @@ int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
/* Create per-opp directory */
d = debugfs_create_dir(name, pdentry);
- if (!d)
- return -ENOMEM;
-
- if (!debugfs_create_bool("available", S_IRUGO, d, &opp->available))
- return -ENOMEM;
-
- if (!debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic))
- return -ENOMEM;
-
- if (!debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo))
- return -ENOMEM;
-
- if (!debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend))
- return -ENOMEM;
-
- if (!debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate))
- return -ENOMEM;
- if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate))
- return -ENOMEM;
+ 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);
- if (!opp_debug_create_supplies(opp, opp_table, d))
- return -ENOMEM;
-
- if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
- &opp->clock_latency_ns))
- return -ENOMEM;
+ opp_debug_create_supplies(opp, opp_table, d);
opp->dentry = d;
- return 0;
}
-static int opp_list_debug_create_dir(struct opp_device *opp_dev,
- struct opp_table *opp_table)
+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;
@@ -137,36 +111,21 @@ static int opp_list_debug_create_dir(struct opp_device *opp_dev,
/* Create device specific directory */
d = debugfs_create_dir(opp_table->dentry_name, rootdir);
- if (!d) {
- dev_err(dev, "%s: Failed to create debugfs dir\n", __func__);
- return -ENOMEM;
- }
opp_dev->dentry = d;
opp_table->dentry = d;
-
- return 0;
}
-static int opp_list_debug_create_link(struct opp_device *opp_dev,
- struct opp_table *opp_table)
+static void opp_list_debug_create_link(struct opp_device *opp_dev,
+ struct opp_table *opp_table)
{
- const struct device *dev = opp_dev->dev;
char name[NAME_MAX];
- struct dentry *d;
opp_set_dev_name(opp_dev->dev, name);
/* Create device specific directory link */
- d = debugfs_create_symlink(name, rootdir, opp_table->dentry_name);
- if (!d) {
- dev_err(dev, "%s: Failed to create link\n", __func__);
- return -ENOMEM;
- }
-
- opp_dev->dentry = d;
-
- return 0;
+ opp_dev->dentry = debugfs_create_symlink(name, rootdir,
+ opp_table->dentry_name);
}
/**
@@ -177,20 +136,13 @@ static int opp_list_debug_create_link(struct opp_device *opp_dev,
* 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.
- *
- * Return: 0 on success, otherwise negative error.
*/
-int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
+void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
{
- if (!rootdir) {
- pr_debug("%s: Uninitialized rootdir\n", __func__);
- return -EINVAL;
- }
-
if (opp_table->dentry)
- return opp_list_debug_create_link(opp_dev, opp_table);
-
- return opp_list_debug_create_dir(opp_dev, opp_table);
+ 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,
@@ -252,10 +204,6 @@ static int __init opp_debug_init(void)
{
/* Create /sys/kernel/debug/opp directory */
rootdir = debugfs_create_dir("opp", NULL);
- if (!rootdir) {
- pr_err("%s: Failed to create root directory\n", __func__);
- return -ENOMEM;
- }
return 0;
}
diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index 1779f2c93291..62504b18f198 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -20,6 +20,7 @@
#include <linux/pm_domain.h>
#include <linux/slab.h>
#include <linux/export.h>
+#include <linux/energy_model.h>
#include "opp.h"
@@ -1049,3 +1050,101 @@ struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
return of_node_get(opp->np);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node);
+
+/*
+ * Callback function provided to the Energy Model framework upon registration.
+ * This computes the power estimated by @CPU at @kHz if it is the frequency
+ * of an existing OPP, or at the frequency of the first OPP above @kHz otherwise
+ * (see dev_pm_opp_find_freq_ceil()). This function updates @kHz to the ceiled
+ * frequency and @mW to the associated power. The power is estimated as
+ * P = C * V^2 * f with C being the CPU's capacitance and V and f respectively
+ * the voltage and frequency of the OPP.
+ *
+ * Returns -ENODEV if the CPU device cannot be found, -EINVAL if the power
+ * calculation failed because of missing parameters, 0 otherwise.
+ */
+static int __maybe_unused _get_cpu_power(unsigned long *mW, unsigned long *kHz,
+ int cpu)
+{
+ struct device *cpu_dev;
+ struct dev_pm_opp *opp;
+ struct device_node *np;
+ unsigned long mV, Hz;
+ u32 cap;
+ u64 tmp;
+ int ret;
+
+ cpu_dev = get_cpu_device(cpu);
+ if (!cpu_dev)
+ return -ENODEV;
+
+ np = of_node_get(cpu_dev->of_node);
+ if (!np)
+ return -EINVAL;
+
+ ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap);
+ of_node_put(np);
+ if (ret)
+ return -EINVAL;
+
+ Hz = *kHz * 1000;
+ opp = dev_pm_opp_find_freq_ceil(cpu_dev, &Hz);
+ if (IS_ERR(opp))
+ return -EINVAL;
+
+ mV = dev_pm_opp_get_voltage(opp) / 1000;
+ dev_pm_opp_put(opp);
+ if (!mV)
+ return -EINVAL;
+
+ tmp = (u64)cap * mV * mV * (Hz / 1000000);
+ do_div(tmp, 1000000000);
+
+ *mW = (unsigned long)tmp;
+ *kHz = Hz / 1000;
+
+ return 0;
+}
+
+/**
+ * dev_pm_opp_of_register_em() - Attempt to register an Energy Model
+ * @cpus : CPUs for which an Energy Model has to be registered
+ *
+ * This checks whether the "dynamic-power-coefficient" devicetree property has
+ * been specified, and tries to register an Energy Model with it if it has.
+ */
+void dev_pm_opp_of_register_em(struct cpumask *cpus)
+{
+ struct em_data_callback em_cb = EM_DATA_CB(_get_cpu_power);
+ int ret, nr_opp, cpu = cpumask_first(cpus);
+ struct device *cpu_dev;
+ struct device_node *np;
+ u32 cap;
+
+ cpu_dev = get_cpu_device(cpu);
+ if (!cpu_dev)
+ return;
+
+ nr_opp = dev_pm_opp_get_opp_count(cpu_dev);
+ if (nr_opp <= 0)
+ return;
+
+ np = of_node_get(cpu_dev->of_node);
+ if (!np)
+ return;
+
+ /*
+ * Register an EM only if the 'dynamic-power-coefficient' property is
+ * set in devicetree. It is assumed the voltage values are known if that
+ * property is set since it is useless otherwise. If voltages are not
+ * known, just let the EM registration fail with an error to alert the
+ * user about the inconsistent configuration.
+ */
+ ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap);
+ of_node_put(np);
+ if (ret || !cap)
+ return;
+
+ em_register_perf_domain(cpus, nr_opp, &em_cb);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_of_register_em);
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index 4458175aa661..569b3525aa67 100644
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -238,18 +238,17 @@ static inline void _of_opp_free_required_opps(struct opp_table *opp_table,
#ifdef CONFIG_DEBUG_FS
void opp_debug_remove_one(struct dev_pm_opp *opp);
-int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
-int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
+void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
+void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
#else
static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
-static inline int opp_debug_create_one(struct dev_pm_opp *opp,
- struct opp_table *opp_table)
-{ return 0; }
-static inline int opp_debug_register(struct opp_device *opp_dev,
- struct opp_table *opp_table)
-{ return 0; }
+static inline void opp_debug_create_one(struct dev_pm_opp *opp,
+ struct opp_table *opp_table) { }
+
+static inline void opp_debug_register(struct opp_device *opp_dev,
+ struct opp_table *opp_table) { }
static inline void opp_debug_unregister(struct opp_device *opp_dev,
struct opp_table *opp_table)
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-02 22:01:12 +0300