lkml.org 
[lkml]   [2020]   [Jan]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[Patch v8 6/7] thermal/cpu-cooling: Update thermal pressure in case of a maximum frequency capping
Date
Thermal governors can request for a cpu's maximum supported frequency to
be capped in case of an overheat event. This in turn means that the
maximum capacity available for tasks to run on the particular cpu is
reduced. Delta between the original maximum capacity and capped maximum
capacity is known as thermal pressure. Enable cpufreq cooling device to
update the thermal pressure in event of a capped maximum frequency.

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
---

v6->v7
- Changed the input argument in arch_set_thermal_pressure from
capped capacity to delta capacity(thermal pressure) as per
Ionela's review comments. Hence the calculation for delta
capacity(thermal pressure) is moved to cpufreq_cooling.c.

drivers/thermal/cpufreq_cooling.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c
index fe83d7a..4ae8c85 100644
--- a/drivers/thermal/cpufreq_cooling.c
+++ b/drivers/thermal/cpufreq_cooling.c
@@ -431,6 +431,10 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
unsigned long state)
{
struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
+ struct cpumask *cpus;
+ unsigned int frequency;
+ unsigned long max_capacity, capacity;
+ int ret;

/* Request state should be less than max_level */
if (WARN_ON(state > cpufreq_cdev->max_level))
@@ -442,8 +446,19 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,

cpufreq_cdev->cpufreq_state = state;

- return freq_qos_update_request(&cpufreq_cdev->qos_req,
- get_state_freq(cpufreq_cdev, state));
+ frequency = get_state_freq(cpufreq_cdev, state);
+
+ ret = freq_qos_update_request(&cpufreq_cdev->qos_req, frequency);
+
+ if (ret > 0) {
+ cpus = cpufreq_cdev->policy->cpus;
+ max_capacity = arch_scale_cpu_capacity(cpumask_first(cpus));
+ capacity = frequency * max_capacity;
+ capacity /= cpufreq_cdev->policy->cpuinfo.max_freq;
+ arch_set_thermal_pressure(cpus, max_capacity - capacity);
+ }
+
+ return ret;
}

/* Bind cpufreq callbacks to thermal cooling device ops */
--
2.1.4
\
 
 \ /
  Last update: 2020-01-14 20:58    [W:0.113 / U:74.964 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site