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pm_domain_cpu_gov is selecting a cluster idle state but does not consider
latency tolerance of child CPUs. This results in deeper cluster idle state
whose latency does not meet latency tolerance requirement.
Select deeper idle state only if global and device latency tolerance of all
child CPUs meet.
Test results on SM8750 with 300 usec PM-QoS on CPU0 which is less than
domain idle state entry (2150) + exit (1983) usec latency mentioned in
devicetree, demonstrate the issue.
# echo 300 > /sys/devices/system/cpu/cpu0/power/pm_qos_resume_latency_us
Before: (Usage is incrementing)
======
# cat /sys/kernel/debug/pm_genpd/power-domain-cluster0/idle_states
State Time Spent(ms) Usage Rejected Above Below
S0 29817 537 8 270 0
# cat /sys/kernel/debug/pm_genpd/power-domain-cluster0/idle_states
State Time Spent(ms) Usage Rejected Above Below
S0 30348 542 8 271 0
After: (Usage is not incrementing due to latency tolerance)
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# cat /sys/kernel/debug/pm_genpd/power-domain-cluster0/idle_states
State Time Spent(ms) Usage Rejected Above Below
S0 39319 626 14 307 0
# cat /sys/kernel/debug/pm_genpd/power-domain-cluster0/idle_states
State Time Spent(ms) Usage Rejected Above Below
S0 39319 626 14 307 0
Signed-off-by: Maulik Shah <maulik.shah@oss.qualcomm.com>
Fixes: e94999688e3a ("PM / Domains: Add genpd governor for CPUs")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250709-pmdomain_qos-v2-1-976b12257899@oss.qualcomm.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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For regular cpuidle states we are reflecting over the selected/entered
state to see if the sleep-duration meets the residency for the state. The
output from the reflection is an "above" value to indicate the number of
times the state was too deep and a "below" value for the number of times it
was too shallow.
Let's implement the similar thing for genpd's domain-idlestates along with
genpd's governor and put the information in the genpd's debugfs.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20250314100103.1294715-5-ulf.hansson@linaro.org
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It seems reasonable to collect the core parts for the generic PM domain,
along with its corresponding provider drivers. Therefore let's move the
files from drivers/base/power/ to drivers/pmdomain/ and while at it, let's
also rename the files accordingly.
Moreover, let's also update MAINTAINERS to reflect the update.
Cc: Kevin Hilman <khilman@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20231213113305.29098-1-ulf.hansson@linaro.org
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