linux-stable.git/include/linux/cpuidle.h, branch v4.16.2

Merge branches 'pm-cpuidle' and 'pm-opp'

2018-02-15T11:01:53+00:00

* pm-cpuidle:
  PM: cpuidle: Fix cpuidle_poll_state_init() prototype
  Documentation/ABI: update cpuidle sysfs documentation

* pm-opp:
  opp: cpu: Replace GFP_ATOMIC with GFP_KERNEL in dev_pm_opp_init_cpufreq_table

PM: cpuidle: Fix cpuidle_poll_state_init() prototype

2018-02-12T10:34:22+00:00

Commit f85942207516 (x86: PM: Make APM idle driver initialize polling
state) made apm_init() call cpuidle_poll_state_init(), but that only
is defined for CONFIG_CPU_IDLE set, so make the empty stub of it
available for CONFIG_CPU_IDLE unset too to fix the resulting build
issue.

Fixes: f85942207516 (x86: PM: Make APM idle driver initialize polling state)
Cc: 4.14+  # 4.14+
Signed-off-by: Rafael J. Wysocki

cpuidle: Add new macro to enter a retention idle state

2018-01-02T13:48:55+00:00

If a CPU is entering a low power idle state where it doesn't lose any
context, then there is no need to call cpu_pm_enter()/cpu_pm_exit().
Add a new macro(CPU_PM_CPU_IDLE_ENTER_RETENTION) to be used by cpuidle
drivers when they are entering retention state. By not calling
cpu_pm_enter and cpu_pm_exit we reduce the latency involved in
entering and exiting the retention idle states.

CPU_PM_CPU_IDLE_ENTER_RETENTION assumes that no state is lost and
hence CPU PM notifiers will not be called. We may need a broader
change if we need to support partial retention states effeciently.

On ARM64 based Qualcomm Server Platform we measured below overhead for
for calling cpu_pm_enter and cpu_pm_exit for retention states.

workload: stress --hdd #CPUs --hdd-bytes 32M  -t 30
        Average overhead of cpu_pm_enter - 1.2us
        Average overhead of cpu_pm_exit  - 3.1us

Acked-by: Rafael J. Wysocki 
Acked-by: Sudeep Holla 
Signed-off-by: Prashanth Prakash 
Signed-off-by: Catalin Marinas

Merge branch 'pm-sleep'

2017-09-03T22:06:02+00:00

* pm-sleep:
  ACPI / PM: Check low power idle constraints for debug only
  PM / s2idle: Rename platform operations structure
  PM / s2idle: Rename ->enter_freeze to ->enter_s2idle
  PM / s2idle: Rename freeze_state enum and related items
  PM / s2idle: Rename PM_SUSPEND_FREEZE to PM_SUSPEND_TO_IDLE
  ACPI / PM: Prefer suspend-to-idle over S3 on some systems
  platform/x86: intel-hid: Wake up Dell Latitude 7275 from suspend-to-idle
  PM / suspend: Define pr_fmt() in suspend.c
  PM / suspend: Use mem_sleep_labels[] strings in messages
  PM / sleep: Put pm_test under CONFIG_PM_SLEEP_DEBUG
  PM / sleep: Check pm_wakeup_pending() in __device_suspend_noirq()
  PM / core: Add error argument to dpm_show_time()
  PM / core: Split dpm_suspend_noirq() and dpm_resume_noirq()
  PM / s2idle: Rearrange the main suspend-to-idle loop
  PM / timekeeping: Print debug messages when requested
  PM / sleep: Mark suspend/hibernation start and finish
  PM / sleep: Do not print debug messages by default
  PM / suspend: Export pm_suspend_target_state

cpuidle: Make drivers initialize polling state

2017-08-30T01:06:33+00:00

Make the drivers that want to include the polling state into their
states table initialize it explicitly and drop the initialization of
it (which in fact is conditional, but that is not obvious from the
code) from the core.

Signed-off-by: Rafael J. Wysocki 
Tested-by: Sudeep Holla 
Acked-by: Daniel Lezcano

cpuidle: Move polling state initialization code to separate file

2017-08-30T01:06:27+00:00

Move the polling state initialization code to a separate file built
conditionally on CONFIG_ARCH_HAS_CPU_RELAX to get rid of the #ifdef
in driver.c.

Signed-off-by: Rafael J. Wysocki 
Tested-by: Sudeep Holla 
Acked-by: Daniel Lezcano

cpuidle: Eliminate the CPUIDLE_DRIVER_STATE_START symbol

2017-08-30T01:05:29+00:00

On some architectures the first (index 0) idle state is a polling
one and it doesn't really save energy, so there is the
CPUIDLE_DRIVER_STATE_START symbol allowing some pieces of
cpuidle code to avoid using that state.

However, this makes the code rather hard to follow.  It is better
to explicitly avoid the polling state, so add a new cpuidle state
flag CPUIDLE_FLAG_POLLING to mark it and make the relevant code
check that flag for the first state instead of using the
CPUIDLE_DRIVER_STATE_START symbol.

In the ACPI processor driver that cannot always rely on the state
flags (like before the states table has been set up) define
a new internal symbol ACPI_IDLE_STATE_START equivalent to the
CPUIDLE_DRIVER_STATE_START one and drop the latter.

Signed-off-by: Rafael J. Wysocki 
Tested-by: Sudeep Holla 
Acked-by: Daniel Lezcano

PM / s2idle: Rename ->enter_freeze to ->enter_s2idle

2017-08-10T23:29:56+00:00

Rename the ->enter_freeze cpuidle driver callback to ->enter_s2idle
to make it clear that it is used for entering suspend-to-idle and
rename the related functions, variables and so on accordingly.

Signed-off-by: Rafael J. Wysocki

cpuidle:powernv: Add helper function to populate powernv idle states.

2017-01-30T21:32:13+00:00

In the current code for powernv_add_idle_states, there is a lot of code
duplication while initializing an idle state in powernv_states table.

Add an inline helper function to populate the powernv_states[] table
for a given idle state. Invoke this for populating the "Nap",
"Fastsleep" and the stop states in powernv_add_idle_states.

Signed-off-by: Gautham R. Shenoy 
Acked-by: Balbir Singh 
Acked-by: Rafael J. Wysocki 
Signed-off-by: Michael Ellerman

cpuidle: Allow enforcing deepest idle state selection

2016-11-29T13:02:21+00:00

When idle injection is used to cap power, we need to override the
governor's choice of idle states.

For this reason, make it possible the deepest idle state selection to
be enforced by setting a flag on a given CPU to achieve the maximum
potential power draw reduction.

Signed-off-by: Jacob Pan 
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki