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Power management fixes for 6.18-rc3

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- Add missing _RET == 0 condition to recently introduced conditional
    guard definitions for runtime PM (Rafael Wysocki)
 
  - Revert a cpuidle menu governor change that introduced a serious
    performance regression on Chromebooks with Intel Jasper Lake
    processors (Rafael Wysocki)
 
  - Fix an amd-pstate driver regression leading to EPP=0 after
    hibernation (Mario Limonciello)
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Merge tag 'pm-6.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These revert a cpuidle menu governor commit leading to a performance
  regression, fix an amd-pstate driver regression introduced recently,
  and fix new conditional guard definitions for runtime PM.

   - Add missing _RET == 0 condition to recently introduced conditional
     guard definitions for runtime PM (Rafael Wysocki)

   - Revert a cpuidle menu governor change that introduced a serious
     performance regression on Chromebooks with Intel Jasper Lake
     processors (Rafael Wysocki)

   - Fix an amd-pstate driver regression leading to EPP=0 after
     hibernation (Mario Limonciello)"

* tag 'pm-6.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: runtime: Fix conditional guard definitions
  Revert "cpuidle: menu: Avoid discarding useful information"
  cpufreq/amd-pstate: Fix a regression leading to EPP 0 after hibernate
This commit is contained in:
Linus Torvalds 2025-10-23 06:48:32 -10:00
commit 85db0c0a97
3 changed files with 18 additions and 17 deletions
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6
drivers/cpufreq/amd-pstate.c
View File

@ -1614,7 +1614,11 @@ static int amd_pstate_cpu_offline(struct cpufreq_policy *policy)
* min_perf value across kexec reboots. If this CPU is just onlined normally after this, the
* limits, epp and desired perf will get reset to the cached values in cpudata struct
*/
return amd_pstate_update_perf(policy, perf.bios_min_perf, 0U, 0U, 0U, false);
return amd_pstate_update_perf(policy, perf.bios_min_perf,
FIELD_GET(AMD_CPPC_DES_PERF_MASK, cpudata->cppc_req_cached),
FIELD_GET(AMD_CPPC_MAX_PERF_MASK, cpudata->cppc_req_cached),
FIELD_GET(AMD_CPPC_EPP_PERF_MASK, cpudata->cppc_req_cached),
false);
}
static int amd_pstate_suspend(struct cpufreq_policy *policy)

21
drivers/cpuidle/governors/menu.c
View File

@ -188,20 +188,17 @@ static unsigned int get_typical_interval(struct menu_device *data)
*
* This can deal with workloads that have long pauses interspersed
* with sporadic activity with a bunch of short pauses.
*
* However, if the number of remaining samples is too small to exclude
* any more outliers, allow the deepest available idle state to be
* selected because there are systems where the time spent by CPUs in
* deep idle states is correlated to the maximum frequency the CPUs
* can get to. On those systems, shallow idle states should be avoided
* unless there is a clear indication that the given CPU is most likley
* going to be woken up shortly.
*/
if (divisor * 4 <= INTERVALS * 3) {
/*
* If there are sufficiently many data points still under
* consideration after the outliers have been eliminated,
* returning without a prediction would be a mistake because it
* is likely that the next interval will not exceed the current
* maximum, so return the latter in that case.
*/
if (divisor >= INTERVALS / 2)
return max;
if (divisor * 4 <= INTERVALS * 3)
return UINT_MAX;
}
/* Update the thresholds for the next round. */
if (avg - min > max - avg)

8
include/linux/pm_runtime.h
View File

@ -629,13 +629,13 @@ DEFINE_GUARD(pm_runtime_active_auto, struct device *,
* device.
*/
DEFINE_GUARD_COND(pm_runtime_active, _try,
pm_runtime_get_active(_T, RPM_TRANSPARENT))
pm_runtime_get_active(_T, RPM_TRANSPARENT), _RET == 0)
DEFINE_GUARD_COND(pm_runtime_active, _try_enabled,
pm_runtime_resume_and_get(_T))
pm_runtime_resume_and_get(_T), _RET == 0)
DEFINE_GUARD_COND(pm_runtime_active_auto, _try,
pm_runtime_get_active(_T, RPM_TRANSPARENT))
pm_runtime_get_active(_T, RPM_TRANSPARENT), _RET == 0)
DEFINE_GUARD_COND(pm_runtime_active_auto, _try_enabled,
pm_runtime_resume_and_get(_T))
pm_runtime_resume_and_get(_T), _RET == 0)
/**
* pm_runtime_put_sync - Drop device usage counter and run "idle check" if 0.