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path: root/drivers/thermal/devfreq_cooling.c
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Diffstat (limited to 'drivers/thermal/devfreq_cooling.c')
-rw-r--r--drivers/thermal/devfreq_cooling.c152
1 files changed, 111 insertions, 41 deletions
diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c
index 4bf4ad58cffd..ef59256887ff 100644
--- a/drivers/thermal/devfreq_cooling.c
+++ b/drivers/thermal/devfreq_cooling.c
@@ -28,6 +28,8 @@
#include <trace/events/thermal.h>
+#define SCALE_ERROR_MITIGATION 100
+
static DEFINE_IDA(devfreq_ida);
/**
@@ -45,6 +47,12 @@ static DEFINE_IDA(devfreq_ida);
* @freq_table_size: Size of the @freq_table and @power_table
* @power_ops: Pointer to devfreq_cooling_power, used to generate the
* @power_table.
+ * @res_util: Resource utilization scaling factor for the power.
+ * It is multiplied by 100 to minimize the error. It is used
+ * for estimation of the power budget instead of using
+ * 'utilization' (which is 'busy_time / 'total_time').
+ * The 'res_util' range is from 100 to (power_table[state] * 100)
+ * for the corresponding 'state'.
*/
struct devfreq_cooling_device {
int id;
@@ -55,6 +63,8 @@ struct devfreq_cooling_device {
u32 *freq_table;
size_t freq_table_size;
struct devfreq_cooling_power *power_ops;
+ u32 res_util;
+ int capped_state;
};
/**
@@ -164,27 +174,12 @@ freq_get_state(struct devfreq_cooling_device *dfc, unsigned long freq)
return THERMAL_CSTATE_INVALID;
}
-/**
- * get_static_power() - calculate the static power
- * @dfc: Pointer to devfreq cooling device
- * @freq: Frequency in Hz
- *
- * Calculate the static power in milliwatts using the supplied
- * get_static_power(). The current voltage is calculated using the
- * OPP library. If no get_static_power() was supplied, assume the
- * static power is negligible.
- */
-static unsigned long
-get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq)
+static unsigned long get_voltage(struct devfreq *df, unsigned long freq)
{
- struct devfreq *df = dfc->devfreq;
struct device *dev = df->dev.parent;
unsigned long voltage;
struct dev_pm_opp *opp;
- if (!dfc->power_ops->get_static_power)
- return 0;
-
opp = dev_pm_opp_find_freq_exact(dev, freq, true);
if (PTR_ERR(opp) == -ERANGE)
opp = dev_pm_opp_find_freq_exact(dev, freq, false);
@@ -202,9 +197,35 @@ get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq)
dev_err_ratelimited(dev,
"Failed to get voltage for frequency %lu\n",
freq);
- return 0;
}
+ return voltage;
+}
+
+/**
+ * get_static_power() - calculate the static power
+ * @dfc: Pointer to devfreq cooling device
+ * @freq: Frequency in Hz
+ *
+ * Calculate the static power in milliwatts using the supplied
+ * get_static_power(). The current voltage is calculated using the
+ * OPP library. If no get_static_power() was supplied, assume the
+ * static power is negligible.
+ */
+static unsigned long
+get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq)
+{
+ struct devfreq *df = dfc->devfreq;
+ unsigned long voltage;
+
+ if (!dfc->power_ops->get_static_power)
+ return 0;
+
+ voltage = get_voltage(df, freq);
+
+ if (voltage == 0)
+ return 0;
+
return dfc->power_ops->get_static_power(df, voltage);
}
@@ -239,6 +260,16 @@ get_dynamic_power(struct devfreq_cooling_device *dfc, unsigned long freq,
return power;
}
+
+static inline unsigned long get_total_power(struct devfreq_cooling_device *dfc,
+ unsigned long freq,
+ unsigned long voltage)
+{
+ return get_static_power(dfc, freq) + get_dynamic_power(dfc, freq,
+ voltage);
+}
+
+
static int devfreq_cooling_get_requested_power(struct thermal_cooling_device *cdev,
struct thermal_zone_device *tz,
u32 *power)
@@ -248,27 +279,55 @@ static int devfreq_cooling_get_requested_power(struct thermal_cooling_device *cd
struct devfreq_dev_status *status = &df->last_status;
unsigned long state;
unsigned long freq = status->current_frequency;
- u32 dyn_power, static_power;
+ unsigned long voltage;
+ u32 dyn_power = 0;
+ u32 static_power = 0;
+ int res;
- /* Get dynamic power for state */
state = freq_get_state(dfc, freq);
- if (state == THERMAL_CSTATE_INVALID)
- return -EAGAIN;
+ if (state == THERMAL_CSTATE_INVALID) {
+ res = -EAGAIN;
+ goto fail;
+ }
- dyn_power = dfc->power_table[state];
+ if (dfc->power_ops->get_real_power) {
+ voltage = get_voltage(df, freq);
+ if (voltage == 0) {
+ res = -EINVAL;
+ goto fail;
+ }
- /* Scale dynamic power for utilization */
- dyn_power = (dyn_power * status->busy_time) / status->total_time;
+ res = dfc->power_ops->get_real_power(df, power, freq, voltage);
+ if (!res) {
+ state = dfc->capped_state;
+ dfc->res_util = dfc->power_table[state];
+ dfc->res_util *= SCALE_ERROR_MITIGATION;
- /* Get static power */
- static_power = get_static_power(dfc, freq);
+ if (*power > 1)
+ dfc->res_util /= *power;
+ } else {
+ goto fail;
+ }
+ } else {
+ dyn_power = dfc->power_table[state];
- trace_thermal_power_devfreq_get_power(cdev, status, freq, dyn_power,
- static_power);
+ /* Scale dynamic power for utilization */
+ dyn_power *= status->busy_time;
+ dyn_power /= status->total_time;
+ /* Get static power */
+ static_power = get_static_power(dfc, freq);
- *power = dyn_power + static_power;
+ *power = dyn_power + static_power;
+ }
+
+ trace_thermal_power_devfreq_get_power(cdev, status, freq, dyn_power,
+ static_power, *power);
return 0;
+fail:
+ /* It is safe to set max in this case */
+ dfc->res_util = SCALE_ERROR_MITIGATION;
+ return res;
}
static int devfreq_cooling_state2power(struct thermal_cooling_device *cdev,
@@ -301,26 +360,34 @@ static int devfreq_cooling_power2state(struct thermal_cooling_device *cdev,
unsigned long busy_time;
s32 dyn_power;
u32 static_power;
+ s32 est_power;
int i;
- static_power = get_static_power(dfc, freq);
+ if (dfc->power_ops->get_real_power) {
+ /* Scale for resource utilization */
+ est_power = power * dfc->res_util;
+ est_power /= SCALE_ERROR_MITIGATION;
+ } else {
+ static_power = get_static_power(dfc, freq);
- dyn_power = power - static_power;
- dyn_power = dyn_power > 0 ? dyn_power : 0;
+ dyn_power = power - static_power;
+ dyn_power = dyn_power > 0 ? dyn_power : 0;
- /* Scale dynamic power for utilization */
- busy_time = status->busy_time ?: 1;
- dyn_power = (dyn_power * status->total_time) / busy_time;
+ /* Scale dynamic power for utilization */
+ busy_time = status->busy_time ?: 1;
+ est_power = (dyn_power * status->total_time) / busy_time;
+ }
/*
* Find the first cooling state that is within the power
* budget for dynamic power.
*/
for (i = 0; i < dfc->freq_table_size - 1; i++)
- if (dyn_power >= dfc->power_table[i])
+ if (est_power >= dfc->power_table[i])
break;
*state = i;
+ dfc->capped_state = i;
trace_thermal_power_devfreq_limit(cdev, freq, *state, power);
return 0;
}
@@ -376,7 +443,7 @@ static int devfreq_cooling_gen_tables(struct devfreq_cooling_device *dfc)
}
for (i = 0, freq = ULONG_MAX; i < num_opps; i++, freq--) {
- unsigned long power_dyn, voltage;
+ unsigned long power, voltage;
struct dev_pm_opp *opp;
opp = dev_pm_opp_find_freq_floor(dev, &freq);
@@ -389,12 +456,15 @@ static int devfreq_cooling_gen_tables(struct devfreq_cooling_device *dfc)
dev_pm_opp_put(opp);
if (dfc->power_ops) {
- power_dyn = get_dynamic_power(dfc, freq, voltage);
+ if (dfc->power_ops->get_real_power)
+ power = get_total_power(dfc, freq, voltage);
+ else
+ power = get_dynamic_power(dfc, freq, voltage);
- dev_dbg(dev, "Dynamic power table: %lu MHz @ %lu mV: %lu = %lu mW\n",
- freq / 1000000, voltage, power_dyn, power_dyn);
+ dev_dbg(dev, "Power table: %lu MHz @ %lu mV: %lu = %lu mW\n",
+ freq / 1000000, voltage, power, power);
- power_table[i] = power_dyn;
+ power_table[i] = power;
}
freq_table[i] = freq;
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-20 17:17:17 +0300