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thermal: gov_power_allocator: Support new update callback of weights

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When the thermal instance's weight is updated from the sysfs the governor
update_tz() callback is triggered. Implement proper reaction to this
event in the IPA, which would save CPU cycles spent in throttle().
This will speed-up the main throttle() IPA function and clean it up
a bit.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lukasz Luba 2023-12-20 23:17:53 +00:00 committed by Rafael J. Wysocki
parent bfc57bd168
commit a3cd6db4cc
1 changed files with 9 additions and 6 deletions
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15
drivers/thermal/gov_power_allocator.c
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@ -77,6 +77,7 @@ struct power_actor {
* @trip_switch_on should be NULL.
* @trip_max: last passive trip point of the thermal zone. The
* temperature we are controlling for.
* @total_weight: Sum of all thermal instances weights
* @num_actors: number of cooling devices supporting IPA callbacks
* @buffer_size: internal buffer size, to avoid runtime re-calculation
* @power: buffer for all power actors internal power information
@ -88,6 +89,7 @@ struct power_allocator_params {
u32 sustainable_power;
const struct thermal_trip *trip_switch_on;
const struct thermal_trip *trip_max;
int total_weight;
unsigned int num_actors;
unsigned int buffer_size;
struct power_actor *power;
@ -405,16 +407,11 @@ static int allocate_power(struct thermal_zone_device *tz, int control_temp)
u32 total_granted_power = 0;
u32 total_req_power = 0;
u32 power_range, weight;
int total_weight = 0;
int i = 0, ret;
if (!num_actors)
return -ENODEV;
list_for_each_entry(instance, &tz->thermal_instances, tz_node)
if (power_actor_is_valid(params, instance))
total_weight += instance->weight;
/* Clean all buffers for new power estimations */
memset(power, 0, params->buffer_size);
@ -430,7 +427,7 @@ static int allocate_power(struct thermal_zone_device *tz, int control_temp)
if (ret)
continue;
if (!total_weight)
if (!params->total_weight)
weight = 1 << FRAC_BITS;
else
weight = instance->weight;
@ -651,6 +648,12 @@ static void power_allocator_update_tz(struct thermal_zone_device *tz,
allocate_actors_buffer(params, num_actors);
break;
case THERMAL_INSTANCE_WEIGHT_CHANGED:
params->total_weight = 0;
list_for_each_entry(instance, &tz->thermal_instances, tz_node)
if (power_actor_is_valid(params, instance))
params->total_weight += instance->weight;
break;
default:
break;
}