linux.git/drivers/base/power/opp, branch v4.4

Merge tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2015-11-12T19:50:33+00:00

Pull more power management and ACPI updates from Rafael Wysocki:
 "The only new feature in this batch is support for the ACPI _CCA device
  configuration object, which it a pre-requisite for future ACPI PCI
  support on ARM64, but should not affect the other architectures.

  The rest is fixes and cleanups, mostly in cpufreq (including
  intel_pstate), the Operating Performace Points (OPP) framework and
  tools (cpupower and turbostat).

  Specifics:

   - Support for the ACPI _CCA configuration object intended to tell the
     OS whether or not a bus master device supports hardware managed
     cache coherency and a new set of functions to allow drivers to
     check the cache coherency support for devices in a platform
     firmware interface agnostic way (Suravee Suthikulpanit, Jeremy
     Linton).

   - ACPI backlight quirks for ESPRIMO Mobile M9410 and Dell XPS L421X
     (Aaron Lu, Hans de Goede).

   - Fixes for the arm_big_little and s5pv210-cpufreq cpufreq drivers
     (Jon Medhurst, Nicolas Pitre).

   - kfree()-related fixup for the recently introduced CPPC cpufreq
     frontend (Markus Elfring).

   - intel_pstate fix reducing kernel log noise on systems where
     P-states are managed by hardware (Prarit Bhargava).

   - intel_pstate maintainers information update (Srinivas Pandruvada).

   - cpufreq core optimization related to the handling of delayed work
     items used by governors (Viresh Kumar).

   - Locking fixes and cleanups of the Operating Performance Points
     (OPP) framework (Viresh Kumar).

   - Generic power domains framework cleanups (Lina Iyer).

   - cpupower tool updates (Jacob Tanenbaum, Sriram Raghunathan, Thomas
     Renninger).

   - turbostat tool updates (Len Brown)"

* tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (32 commits)
  PCI: ACPI: Add support for PCI device DMA coherency
  PCI: OF: Move of_pci_dma_configure() to pci_dma_configure()
  of/pci: Fix pci_get_host_bridge_device leak
  device property: ACPI: Remove unused DMA APIs
  device property: ACPI: Make use of the new DMA Attribute APIs
  device property: Adding DMA Attribute APIs for Generic Devices
  ACPI: Adding DMA Attribute APIs for ACPI Device
  device property: Introducing enum dev_dma_attr
  ACPI: Honor ACPI _CCA attribute setting
  cpufreq: CPPC: Delete an unnecessary check before the function call kfree()
  PM / OPP: Add opp_rcu_lockdep_assert() to _find_device_opp()
  PM / OPP: Hold dev_opp_list_lock for writers
  PM / OPP: Protect updates to list_dev with mutex
  PM / OPP: Propagate error properly from dev_pm_opp_set_sharing_cpus()
  cpufreq: s5pv210-cpufreq: fix wrong do_div() usage
  MAINTAINERS: update for intel P-state driver
  Creating a common structure initialization pattern for struct option
  cpupower: Enable disabled Cstates if they are below max latency
  cpupower: Remove debug message when using cpupower idle-set -D switch
  cpupower: cpupower monitor reports uninitialized values for offline cpus
  ...

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux

2015-11-11T17:03:01+00:00

Pull thermal updates from Zhang Rui:

 - Implement generic devfreq cooling mechanism through frequency
   reduction for devices using devfreq.  From Ørjan Eide and Javi
   Merino.

 - Introduce OMAP3 support on TI SoC thermal driver.  From Pavel Mack
   and Eduardo Valentin.

 - A bounch of small fixes on devfreq_cooling, Exynos, IMX, Armada, and
   Rockchip thermal drivers.

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux: (24 commits)
  thermal: exynos: Directly return 0 instead of using local ret variable
  thermal: exynos: Remove unneeded semicolon
  thermal: exynos: Use IS_ERR() because regulator cannot be NULL
  thermal: exynos: Fix first temperature read after registering sensor
  thermal: exynos: Fix unbalanced regulator disable on probe failure
  devfreq_cooling: return on allocation failure
  thermal: rockchip: support the sleep pinctrl state to avoid glitches in s2r
  dt-bindings: rockchip-thermal: Add the pinctrl states in this document
  thermal: devfreq_cooling: Make power a u64
  thermal: devfreq_cooling: use a thermal_cooling_device for register and unregister
  thermal: underflow bug in imx_set_trip_temp()
  thermal: armada: Fix possible overflow in the Armada 380 thermal sensor formula
  thermal: imx: register irq handler later in probe
  thermal: rockhip: fix setting thermal shutdown polarity
  thermal: rockchip: fix handling of invalid readings
  devfreq_cooling: add trace information
  thermal: Add devfreq cooling
  PM / OPP: get the voltage for all OPPs
  tools/thermal: tmon: use pkg-config also for CFLAGS
  linux/thermal.h: rename KELVIN_TO_CELSIUS to DECI_KELVIN_TO_CELSIUS
  ...

Merge branch 'pm-opp'

2015-11-07T00:30:40+00:00

* pm-opp:
  PM / OPP: Add opp_rcu_lockdep_assert() to _find_device_opp()
  PM / OPP: Hold dev_opp_list_lock for writers
  PM / OPP: Protect updates to list_dev with mutex
  PM / OPP: Propagate error properly from dev_pm_opp_set_sharing_cpus()
  PM / OPP: Parse all power-supply related bindings together
  PM / OPP: Rename routines specific to old bindings with _v1
  PM / OPP: Improve print messages with pr_fmt

PM / OPP: Add opp_rcu_lockdep_assert() to _find_device_opp()

2015-11-06T22:59:42+00:00

_find_device_opp() should be called with rcu-read lock or
dev_opp_list_lock held. Add the opp_rcu_lockdep_assert() check to make
sure caller have taken appropriate locks.

Fix comment over the routine as well.

Suggested-by: Stephen Boyd 
Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

PM / OPP: Hold dev_opp_list_lock for writers

2015-11-06T22:59:41+00:00

Writers need to update OPP device and their list with dev_opp_list_lock
mutex held, which was missed at few places. Fix it.

Signed-off-by: Viresh Kumar 
Cc: 4.3  # 4.3
Signed-off-by: Rafael J. Wysocki

PM / OPP: Protect updates to list_dev with mutex

2015-11-06T22:59:41+00:00

dev_opp_list_lock is used everywhere to protect device and OPP lists,
but dev_pm_opp_set_sharing_cpus() is missed somehow. And instead we used
rcu-lock, which wouldn't help here as we are adding a new list_dev.

This also fixes a problem where we have called kzalloc(..., GFP_KERNEL)
from within rcu-lock, which isn't allowed as kzalloc can sleep when
called with GFP_KERNEL.

With CONFIG_DEBUG_ATOMIC_SLEEP set, we get following lockdep-splat:

include/linux/rcupdate.h:578 Illegal context switch in RCU read-side critical section!

other info that might help us debug this:

rcu_scheduler_active = 1, debug_locks = 0
5 locks held by swapper/0/1:
 #0:  (&dev->mutex){......}, at: [] __driver_attach+0x48/0x98
 #1:  (&dev->mutex){......}, at: [] __driver_attach+0x58/0x98
 #2:  (cpu_hotplug.lock){++++++}, at: [] get_online_cpus+0x40/0xb0
 #3:  (subsys mutex#5){+.+.+.}, at: [] subsys_interface_register+0x44/0xdc
 #4:  (rcu_read_lock){......}, at: [] dev_pm_opp_set_sharing_cpus+0x0/0x1e4

stack backtrace:
CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W       4.3.0-rc7-00047-g81f5932958a8 #59
Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[] (unwind_backtrace) from [] (show_stack+0x10/0x14)
[] (show_stack) from [] (dump_stack+0x94/0xbc)
[] (dump_stack) from [] (___might_sleep+0x24c/0x298)
[] (___might_sleep) from [] (kmem_cache_alloc+0xe8/0x164)
[] (kmem_cache_alloc) from [] (_add_list_dev+0x30/0x58)
[] (_add_list_dev) from [] (dev_pm_opp_set_sharing_cpus+0xd0/0x1e4)
[] (dev_pm_opp_set_sharing_cpus) from [] (cpufreq_init+0x4cc/0x62c)
[] (cpufreq_init) from [] (cpufreq_online+0xbc/0x73c)
[] (cpufreq_online) from [] (subsys_interface_register+0x98/0xdc)
[] (subsys_interface_register) from [] (cpufreq_register_driver+0x110/0x17c)
[] (cpufreq_register_driver) from [] (dt_cpufreq_probe+0x60/0x8c)
[] (dt_cpufreq_probe) from [] (platform_drv_probe+0x44/0xa4)
[] (platform_drv_probe) from [] (driver_probe_device+0x208/0x2f4)
[] (driver_probe_device) from [] (__driver_attach+0x94/0x98)
[] (__driver_attach) from [] (bus_for_each_dev+0x68/0x9c)

Reported-by: Michael Turquette 
Reviewed-by: Stephen Boyd 
Signed-off-by: Viresh Kumar 
Cc: 4.3  # 4.3
Signed-off-by: Rafael J. Wysocki

PM / OPP: Propagate error properly from dev_pm_opp_set_sharing_cpus()

2015-11-06T22:59:41+00:00

We are returning 0 even in case of errors, fix it.

Fixes: 8d4d4e98acd6 ("PM / OPP: Add helpers for initializing CPU OPPs")
Reported-by: Dan Carpenter 
Reviewed-by: Stephen Boyd 
Signed-off-by: Viresh Kumar 
Cc: 4.3  # 4.3
Signed-off-by: Rafael J. Wysocki

PM / OPP: Parse all power-supply related bindings together

2015-11-02T00:51:23+00:00

Move all DT parsing for the power supplies to a single function, rather
than keeping them at separate places. This will help manage things
properly.

Signed-off-by: Viresh Kumar 
Reviewed-by: Stephen Boyd 
Signed-off-by: Rafael J. Wysocki

PM / OPP: Rename routines specific to old bindings with _v1

2015-11-02T00:48:48+00:00

Clearly distinguish routines based on what version of bindings they
parse. We have already postfixed routines properly with _v2 for new
bindings. Postfix the older ones now with _v1.

Signed-off-by: Viresh Kumar 
Reviewed-by: Stephen Boyd 
Signed-off-by: Rafael J. Wysocki

PM / OPP: Improve print messages with pr_fmt

2015-11-02T00:47:43+00:00

To identify OPP core's print messages easily, prefix them with
KBUILD_MODNAME.

Signed-off-by: Viresh Kumar 
Reviewed-by: Stephen Boyd 
Signed-off-by: Rafael J. Wysocki