linux-toradex.git/kernel/power, branch v5.6-rc6

PM / hibernate: fix typo "reserverd_size" -> "reserved_size"

2020-02-20T10:58:01+00:00

Fix a mistake in a variable name in a comment.

Signed-off-by: Alexandre Belloni 
Signed-off-by: Rafael J. Wysocki

ACPI: PM: s2idle: Avoid possible race related to the EC GPE

2020-02-11T09:11:02+00:00

It is theoretically possible for the ACPI EC GPE to be set after the
s2idle_ops->wake() called from s2idle_loop() has returned and before
the subsequent pm_wakeup_pending() check is carried out.  If that
happens, the resulting wakeup event will cause the system to resume
even though it may be a spurious one.

To avoid that race, first make the ->wake() callback in struct
platform_s2idle_ops return a bool value indicating whether or not
to let the system resume and rearrange s2idle_loop() to use that
value instad of the direct pm_wakeup_pending() call if ->wake() is
present.

Next, rework acpi_s2idle_wake() to process EC events and check
pm_wakeup_pending() before re-arming the SCI for system wakeup
to prevent it from triggering prematurely and add comments to
that function to explain the rationale for the new code flow.

Fixes: 56b991849009 ("PM: sleep: Simplify suspend-to-idle control flow")
Cc: 5.4+  # 5.4+
Signed-off-by: Rafael J. Wysocki

Merge back new material related to system-wide PM for v5.6.

2020-01-23T15:00:56+00:00

PM: hibernate: fix crashes with init_on_free=1

2020-01-16T22:51:45+00:00

Upon resuming from hibernation, free pages may contain stale data from
the kernel that initiated the resume. This breaks the invariant
inflicted by init_on_free=1 that freed pages must be zeroed.

To deal with this problem, make clear_free_pages() also clear the free
pages when init_on_free is enabled.

Fixes: 6471384af2a6 ("mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options")
Reported-by: Johannes Stezenbach 
Signed-off-by: Alexander Potapenko 
Cc: 5.3+  # 5.3+
Signed-off-by: Rafael J. Wysocki

PM: suspend: Add sysfs attribute to control the "sync on suspend" behavior

2020-01-16T20:47:03+00:00

The sysfs attribute `/sys/power/sync_on_suspend` controls, whether or not
filesystems are synced by the kernel before system suspend.

Congruously, the behaviour of build-time switch CONFIG_SUSPEND_SKIP_SYNC
is slightly changed: It now defines the run-tim default for the new sysfs
attribute `/sys/power/sync_on_suspend`.

The run-time attribute is added because the existing corresponding
build-time Kconfig flag for (`CONFIG_SUSPEND_SKIP_SYNC`) is not flexible
enough. E.g. Linux distributions that provide pre-compiled kernels
usually want to stick with the default (sync filesystems before suspend)
but under special conditions this needs to be changed.

One example for such a special condition is user-space handling of
suspending block devices (e.g. using `cryptsetup luksSuspend` or `dmsetup
suspend`) before system suspend. The Kernel trying to sync filesystems
after the underlying block device already got suspended obviously leads
to dead-locks. Be aware that you have to take care of the filesystem sync
yourself before suspending the system in those scenarios.

Signed-off-by: Jonas Meurer 
Signed-off-by: Rafael J. Wysocki

PM: hibernate: fix spelling mistake "shapshot" -> "snapshot"

2020-01-10T11:15:30+00:00

There is a spelling mistake in a pr_info message. Fix it.

Signed-off-by: Colin Ian King 
Signed-off-by: Rafael J. Wysocki

PM: hibernate: Add more logging on hibernation failure

2020-01-07T12:31:12+00:00

Hibernation fails when the kernel cannot allocate enough memory
to copy all pages of RAM in use.

Ensure that the failure reason is clearly logged, and clearly
attributable to the hibernation module.

Signed-off-by: Luigi Semenzato 
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki

PM: hibernate: improve arithmetic division in preallocate_highmem_fraction()

2020-01-07T11:42:56+00:00

do_div() does a 64-by-32 division. Use div64_u64() instead of
do_div() if the divisor is u64, to avoid truncation to 32-bit.

This change also cleans up code a tad.

Signed-off-by: Wen Yang 
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki

PM: sleep: Switch to rtc_time64_to_tm()/rtc_tm_to_time64()

2019-12-20T08:58:08+00:00

Call the 64bit versions of rtc_tm time conversion to avoid the y2038 issue.

Signed-off-by: Alexandre Belloni 
Signed-off-by: Rafael J. Wysocki

Merge tag 'pm-5.5-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2019-12-04T18:48:09+00:00

Pull additional power management updates from Rafael Wysocki:
 "These fix an ACPI EC driver bug exposed by the recent rework of the
  suspend-to-idle code flow, reintroduce frequency constraints into
  device PM QoS (in preparation for adding QoS support to devfreq), drop
  a redundant field from struct cpuidle_state and clean up Kconfig in
  some places.

  Specifics:

   - Avoid a race condition in the ACPI EC driver that may cause systems
     to be unable to leave suspend-to-idle (Rafael Wysocki)

   - Drop the "disabled" field, which is redundant, from struct
     cpuidle_state (Rafael Wysocki)

   - Reintroduce device PM QoS frequency constraints (temporarily
     introduced and than dropped during the 5.4 cycle) in preparation
     for adding QoS support to devfreq (Leonard Crestez)

   - Clean up indentation (in multiple places) and the cpuidle drivers
     help text in Kconfig (Krzysztof Kozlowski, Randy Dunlap)"

* tag 'pm-5.5-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: PM: s2idle: Rework ACPI events synchronization
  ACPI: EC: Rework flushing of pending work
  PM / devfreq: Add missing locking while setting suspend_freq
  PM / QoS: Restore DEV_PM_QOS_MIN/MAX_FREQUENCY
  PM / QoS: Reorder pm_qos/freq_qos/dev_pm_qos structs
  PM / QoS: Initial kunit test
  PM / QoS: Redefine FREQ_QOS_MAX_DEFAULT_VALUE to S32_MAX
  power: avs: Fix Kconfig indentation
  cpufreq: Fix Kconfig indentation
  cpuidle: minor Kconfig help text fixes
  cpuidle: Drop disabled field from struct cpuidle_state
  cpuidle: Fix Kconfig indentation