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Power management updates for 6.17-rc2

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- Allow intel_idle to use _CST information from ACPI tables for
    idle states enumeration on any family of processors (Len Brown).
 
  - Restore corner case behavior of the menu cpuidle governor, related
    to the handling of systems where idle states selected by the governor
    are rejected by the cpuidle driver, inadvertently changed during the
    6.15 development cycle (Rafael Wysocki).
 
  - Add support for Clearwater Forest in the out-of-band (OOB) mode to
    the intel_pstate driver (Srinivas Pandruvada).
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Merge tag 'pm-6.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These remove an artificial limitation from the intel_idle driver,
  update the menu cpuidle governor to restore its previous behavior in a
  corner case and add one more supported platform configuration to the
  intel_pstate driver:

   - Allow intel_idle to use _CST information from ACPI tables for idle
     states enumeration on any family of processors (Len Brown)

   - Restore corner case behavior of the menu cpuidle governor, related
     to the handling of systems where idle states selected by the
     governor are rejected by the cpuidle driver, inadvertently changed
     during the 6.15 development cycle (Rafael Wysocki)

   - Add support for Clearwater Forest in the out-of-band (OOB) mode to
     the intel_pstate driver (Srinivas Pandruvada)"

* tag 'pm-6.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: intel_pstate: Support Clearwater Forest OOB mode
  cpuidle: governors: menu: Avoid using invalid recent intervals data
  intel_idle: Allow loading ACPI tables for any family
This commit is contained in:
Linus Torvalds 2025-08-14 07:55:31 -07:00
commit c28d28a7b0
3 changed files with 19 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/cpufreq/intel_pstate.c
View File

@ -2793,6 +2793,7 @@ static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
X86_MATCH(INTEL_GRANITERAPIDS_X, core_funcs),
X86_MATCH(INTEL_ATOM_CRESTMONT, core_funcs),
X86_MATCH(INTEL_ATOM_CRESTMONT_X, core_funcs),
X86_MATCH(INTEL_ATOM_DARKMONT_X, core_funcs),
{}
};
#endif

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

@ -97,6 +97,14 @@ static inline int which_bucket(u64 duration_ns)
static DEFINE_PER_CPU(struct menu_device, menu_devices);
static void menu_update_intervals(struct menu_device *data, unsigned int interval_us)
{
/* Update the repeating-pattern data. */
data->intervals[data->interval_ptr++] = interval_us;
if (data->interval_ptr >= INTERVALS)
data->interval_ptr = 0;
}
static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev);
/*
@ -222,6 +230,14 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
if (data->needs_update) {
menu_update(drv, dev);
data->needs_update = 0;
} else if (!dev->last_residency_ns) {
/*
* This happens when the driver rejects the previously selected
* idle state and returns an error, so update the recent
* intervals table to prevent invalid information from being
* used going forward.
*/
menu_update_intervals(data, UINT_MAX);
}
/* Find the shortest expected idle interval. */
@ -482,10 +498,7 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev)
data->correction_factor[data->bucket] = new_factor;
/* update the repeating-pattern data */
data->intervals[data->interval_ptr++] = ktime_to_us(measured_ns);
if (data->interval_ptr >= INTERVALS)
data->interval_ptr = 0;
menu_update_intervals(data, ktime_to_us(measured_ns));
}
/**

2
drivers/idle/intel_idle.c
View File

@ -1679,7 +1679,7 @@ static const struct x86_cpu_id intel_idle_ids[] __initconst = {
};
static const struct x86_cpu_id intel_mwait_ids[] __initconst = {
X86_MATCH_VENDOR_FAM_FEATURE(INTEL, 6, X86_FEATURE_MWAIT, NULL),
X86_MATCH_VENDOR_FAM_FEATURE(INTEL, X86_FAMILY_ANY, X86_FEATURE_MWAIT, NULL),
{}
};