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authorLinus Torvalds <torvalds@linux-foundation.org>2018-04-03 10:45:39 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-03 10:45:39 -0700
commitf2d285669aae656dfeafa0bf25e86bbbc5d22329 (patch)
tree4391c45051429c09199d7fd2ca6ca0dd142a5ed6 /Documentation/ABI
parentbe5537542743f72c7cedddd145c17cf7706baa23 (diff)
parent103cf0e5799ce024fd28dfab716d7111afe4b117 (diff)
Merge tag 'pm-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management updates from Rafael Wysocki: "These update the cpuidle poll state definition to reduce excessive energy usage related to it, add new CPU ID to the RAPL power capping driver, update the ACPI system suspend code to handle some special cases better, extend the PM core's device links code slightly, add new sysfs attribute for better suspend-to-idle diagnostics and easier hibernation handling, update power management tools and clean up cpufreq quite a bit. Specifics: - Modify the cpuidle poll state implementation to prevent CPUs from staying in the loop in there for excessive times (Rafael Wysocki). - Add Intel Cannon Lake chips support to the RAPL power capping driver (Joe Konno). - Add reference counting to the device links handling code in the PM core (Lukas Wunner). - Avoid reconfiguring GPEs on suspend-to-idle in the ACPI system suspend code (Rafael Wysocki). - Allow devices to be put into deeper low-power states via ACPI if both _SxD and _SxW are missing (Daniel Drake). - Reorganize the core ACPI suspend-to-idle wakeup code to avoid a keyboard wakeup issue on Asus UX331UA (Chris Chiu). - Prevent the PCMCIA library code from aborting suspend-to-idle due to noirq suspend failures resulting from incorrect assumptions (Rafael Wysocki). - Add coupled cpuidle supprt to the Exynos3250 platform (Marek Szyprowski). - Add new sysfs file to make it easier to specify the image storage location during hibernation (Mario Limonciello). - Add sysfs files for collecting suspend-to-idle usage and time statistics for CPU idle states (Rafael Wysocki). - Update the pm-graph utilities (Todd Brandt). - Reduce the kernel log noise related to reporting Low-power Idle constraings by the ACPI system suspend code (Rafael Wysocki). - Make it easier to distinguish dedicated wakeup IRQs in the /proc/interrupts output (Tony Lindgren). - Add the frequency table validation in cpufreq to the core and drop it from a number of cpufreq drivers (Viresh Kumar). - Drop "cooling-{min|max}-level" for CPU nodes from a couple of DT bindings (Viresh Kumar). - Clean up the CPU online error code path in the cpufreq core (Viresh Kumar). - Fix assorted issues in the SCPI, CPPC, mediatek and tegra186 cpufreq drivers (Arnd Bergmann, Chunyu Hu, George Cherian, Viresh Kumar). - Drop memory allocation error messages from a few places in cpufreq and cpuildle drivers (Markus Elfring)" * tag 'pm-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (56 commits) ACPI / PM: Fix keyboard wakeup from suspend-to-idle on ASUS UX331UA cpufreq: CPPC: Use transition_delay_us depending transition_latency PM / hibernate: Change message when writing to /sys/power/resume PM / hibernate: Make passing hibernate offsets more friendly cpuidle: poll_state: Avoid invoking local_clock() too often PM: cpuidle/suspend: Add s2idle usage and time state attributes cpuidle: Enable coupled cpuidle support on Exynos3250 platform cpuidle: poll_state: Add time limit to poll_idle() cpufreq: tegra186: Don't validate the frequency table twice cpufreq: speedstep: Don't validate the frequency table twice cpufreq: sparc: Don't validate the frequency table twice cpufreq: sh: Don't validate the frequency table twice cpufreq: sfi: Don't validate the frequency table twice cpufreq: scpi: Don't validate the frequency table twice cpufreq: sc520: Don't validate the frequency table twice cpufreq: s3c24xx: Don't validate the frequency table twice cpufreq: qoirq: Don't validate the frequency table twice cpufreq: pxa: Don't validate the frequency table twice cpufreq: ppc_cbe: Don't validate the frequency table twice cpufreq: powernow: Don't validate the frequency table twice ...
Diffstat (limited to 'Documentation/ABI')
-rw-r--r--Documentation/ABI/testing/sysfs-devices-system-cpu25
-rw-r--r--Documentation/ABI/testing/sysfs-power14
2 files changed, 39 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 4ed63b6cfb15..025b7cf3768d 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -198,6 +198,31 @@ Description:
time (in microseconds) this cpu should spend in this idle state
to make the transition worth the effort.
+What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/s2idle/
+Date: March 2018
+KernelVersion: v4.17
+Contact: Linux power management list <linux-pm@vger.kernel.org>
+Description:
+ Idle state usage statistics related to suspend-to-idle.
+
+ This attribute group is only present for states that can be
+ used in suspend-to-idle with suspended timekeeping.
+
+What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/s2idle/time
+Date: March 2018
+KernelVersion: v4.17
+Contact: Linux power management list <linux-pm@vger.kernel.org>
+Description:
+ Total time spent by the CPU in suspend-to-idle (with scheduler
+ tick suspended) after requesting this state.
+
+What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/s2idle/usage
+Date: March 2018
+KernelVersion: v4.17
+Contact: Linux power management list <linux-pm@vger.kernel.org>
+Description:
+ Total number of times this state has been requested by the CPU
+ while entering suspend-to-idle.
What: /sys/devices/system/cpu/cpu#/cpufreq/*
Date: pre-git history
diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power
index 1e0d1dac706b..2f813d644c69 100644
--- a/Documentation/ABI/testing/sysfs-power
+++ b/Documentation/ABI/testing/sysfs-power
@@ -287,3 +287,17 @@ Description:
Writing a "1" to this file enables the debug messages and
writing a "0" (default) to it disables them. Reads from
this file return the current value.
+
+What: /sys/power/resume_offset
+Date: April 2018
+Contact: Mario Limonciello <mario.limonciello@dell.com>
+Description:
+ This file is used for telling the kernel an offset into a disk
+ to use when hibernating the system such as with a swap file.
+
+ Reads from this file will display the current offset
+ the kernel will be using on the next hibernation
+ attempt.
+
+ Using this sysfs file will override any values that were
+ set using the kernel command line for disk offset. \ No newline at end of file