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2015-04-15cpufreq: intel_pstate: Fix an annoying !CONFIG_SMP warningBorislav Petkov1-6/+6
I keep seeing drivers/cpufreq/intel_pstate.c: In function ‘intel_pstate_init’: drivers/cpufreq/intel_pstate.c:1187:26: warning: initialization from incompatible pointer type struct cpuinfo_x86 *c = &boot_cpu_data; when doing randconfig builds. This is caused by the fact that when !CONFIG_SMP, asm/processor.h defines cpu_info to boot_cpu_data and the local variable struct cpu_defaults *cpu_info overshadows it leading to this unfortunate assignment in the preprocessed source: struct cpu_defaults *boot_cpu_data; struct cpuinfo_x86 *c = &boot_cpu_data; Rename the local variable and use static_cpu_has_safe() which alleviates the need for defining a local cpuinfo_x86 pointer. Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-04-15intel_pstate: Change the setpoint for Atom paramsKristen Carlson Accardi1-1/+1
Change the setpoint for the Baytrail and Cherrytrail CPUs. This will cause more aggressive pstate selection and improves performance on a variety of workloads with little power penalty. Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-04-11intel_pstate: Knights Landing supportDasaratharaman Chandramouli1-0/+31
1. Add Knights Landing (KNL) CPUID to the list of CPUIDs supported by the intel_pstate driver. 2. Add a new cpu_default structure for KNL since KNL has a slightly different mechanism to get turbo pstates from MSRs. Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com> Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> [ rjw: Subject and changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-04-11intel_pstate: remove MSR testKristen Carlson Accardi1-14/+0
x86_match_cpu will not match our cpuid unless APERF/MPERF flag is set, so there is no need to do the manual check for this MSR. Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-04-11cpufreq: fix qoriq uniprocessor buildArnd Bergmann1-0/+2
The qoriq-cpufreq driver contains a hack for powerpc to include asm/smp.h on uniprocessor builds so it can get the hardware CPU number. On ARM, it does not require this hack, but instead gets a compile error: In file included from drivers/cpufreq/qoriq-cpufreq.c:24:0: arch/arm/include/asm/smp.h:18:3: error: #error "<asm/smp.h> included in non-SMP build" arch/arm/include/asm/smp.h:21:0: warning: "raw_smp_processor_id" redefined This adds an #ifdef to mirror the one in its get_cpu_physical_id() function. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: 2f249358eedaf ("cpufreq: qoriq: rename the driver") Cc: Tang Yuantian <Yuantian.Tang@freescale.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-04-10Merge back earlier cpufreq material for v4.1.Rafael J. Wysocki7-73/+206
2015-04-03cpufreq: Schedule work for the first-online CPU on resumeViresh Kumar1-8/+11
All CPUs leaving the first-online CPU are hotplugged out on suspend and and cpufreq core stops managing them. On resume, we need to call cpufreq_update_policy() for this CPU's policy to make sure its frequency is in sync with cpufreq's cached value, as it might have got updated by hardware during suspend/resume. The policies are always added to the top of the policy-list. So, in normal circumstances, CPU 0's policy will be the last one in the list. And so the code checks for the last policy. But there are cases where it will fail. Consider quad-core system, with policy-per core. If CPU0 is hotplugged out and added back again, the last policy will be on CPU1 :( To fix this in a proper way, always look for the policy of the first online CPU. That way we will be sure that we are calling cpufreq_update_policy() for the only CPU that wasn't hotplugged out. Cc: 3.15+ <stable@vger.kernel.org> # 3.15+ Fixes: 2f0aea936360 ("cpufreq: suspend governors on system suspend/hibernate") Reported-by: Saravana Kannan <skannan@codeaurora.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Saravana Kannan <skannan@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-04-02cpufreq: hisilicon: add acpu driverLeo Yan3-0/+52
Add acpu driver for hisilicon SoC, acpu is application processor subsystem. Currently the acpu has the coupled clock domain for two clusters, so this driver will directly use cpufreq-dt driver as backend. Signed-off-by: Leo Yan <leo.yan@linaro.org> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-04-01cpufreq: powernv: Report cpu frequency throttlingShilpasri G Bhat1-1/+46
The power and thermal safety of the system is taken care by an On-Chip-Controller (OCC) which is real-time subsystem embedded within the POWER8 processor. OCC continuously monitors the memory and core temperature, the total system power, state of power supply and fan. The cpu frequency can be throttled by OCC for the following reasons: 1)If a processor crosses its power and temperature limit then OCC will lower its Pmax to reduce the frequency and voltage. 2)If OCC crashes then the system is forced to Psafe frequency. 3)If OCC fails to recover then the kernel is not allowed to do any further frequency changes and the chip will remain in Psafe. The user can see a drop in performance when frequency is throttled and is unaware of throttling. So detect and report such a condition, so the user can check the OCC status to reboot the system or check for power supply or fan failures. The current status of the core is read from Power Management Status Register(PMSR) to check if any of the throttling condition is occurred and the appropriate throttling message is reported. Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> Reviewed-by: Preeti U Murthy <preeti@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-03-18cpufreq: qoriq: rename the driverTang Yuantian4-10/+9
This driver works on all QorIQ platforms which include ARM-based cores and PPC-based cores. Rename it in order to represent better. Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-03-18cpufreq: qoriq: Make the driver usable on all QorIQ platformsTang Yuantian1-62/+99
Freescale introduced new ARM core-based SoCs which support dynamic frequency switch feature. DFS on new SoCs are compatible with current PowerPC CoreNet platforms. In order to support those new platforms, this driver needs to be updated. The main changes include: 1. Changed the names of functions in driver. 2. Added two new functions get_cpu_physical_id() and get_bus_freq(). 3. Used a new way to get the CPU mask which share clock wire. Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-03-06Merge branch 'fixes' of ↵Linus Torvalds1-15/+6
git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal Pull thermal management fixes from Eduardo Valentin: "Specifics: - adding Lukasz as maintainer of samsung thermal driver. - driver fixes: exynos and int430x. - one fix in the exynos cpufreq driver related to cpu cooling (acked by cpufreq maintainer). - fix default sysfs attributes of cooling devices Note: I am sending this pull on Rui's behalf while he fixes issues in his Linux box" * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal: thermal: Make sysfs attributes of cooling devices default attributes Thermal/int340x: Fix memleak for aux trip MAINTAINERS: Add entry for SAMSUNG THERMAL DRIVER cpufreq: exynos: Use simple approach to asses if cpu cooling can be used thermal: exynos: Fix wrong control of power down detection mode for Exynos7
2015-03-04cpufreq: ppc: Add missing #include <asm/smp.h>Geert Uytterhoeven1-0/+2
If CONFIG_SMP=n, <linux/smp.h> does not include <asm/smp.h>, causing: drivers/cpufreq/ppc-corenet-cpufreq.c: In function 'corenet_cpufreq_cpu_init': drivers/cpufreq/ppc-corenet-cpufreq.c:173:3: error: implicit declaration of function 'get_hard_smp_processor_id' [-Werror=implicit-function-declaration] Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-03-02cpufreq: exynos: Use simple approach to asses if cpu cooling can be usedLukasz Majewski1-15/+6
Commit: e725d26c4857e5e41975b5e74e64ce6ab09a7121 provided possibility to use device tree to asses if cpu can be used as cooling device. Since the code was somewhat awkward, simpler approach has been proposed. Test HW: Exynos 4412 - Odroid U3. Suggested-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
2015-02-21Merge tag 'pm+acpi-3.20-rc1-3' of ↵Linus Torvalds2-11/+3
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull one more batch of power management and ACPI updates from Rafael Wysocki: "These are mostly fixes on top of the previously merged recent PM and ACPI material. First, one commit that broke the ACPI LPSS (Low-Power Subsystem) driver on a Dell box is reverted and there are two stable-candidate fixes for that driver. Another fix cleans up two recently added ACPI EC messages that look odd and the printk level of a noisy debug message in the core ACPI resources handling code is reduced. In addition to that we have two stable-candidate fixes for the s3c cpufreq driver, two cpuidle powernv driver updates related to Device Trees and a PNP subsystem cleanup that will allow us to get rid of some old ugliness going forward. Also there is a new blacklist entry for the ACPI backlight code. Specifics: - Revert a recent ACPI LPSS driver commit that prevented the touchpad driver from loading on Dell XPS13 (Jarkko Nikula). - Make the ACPI LPSS driver disable the I2C controllers and deassert SPI host controllers resets at startup on Intel BayTrail and Braswell SoCs in case they have been left in wrong states by the platform firmware which then may casuse fatal controller driver failures during resume from hibernation (Mika Westerberg). - Make two recently added ACPI EC messages look better (Scot Doyle). - Reduce the printk level of a recently added debug message related to ACPI resources that may become noisy in some cases (Rafael J Wysocki). - Add a new ACPI backlight blacklist entry for Samsung Series 9 (900X3C/900X3D/900X3E/900X4C/900X4D) laptops where the native backlight interface doesn't work while the ACPI based one does (Jens Reyer). - Make the PNP sybsystem's core code use __request_region() followed by __release_region() instead of __check_region() which then will allow us to get rid of the latter as it has no more users (Jakub Sitnicki). - Fix a build breakage and an issue with two __init functions that may be called after initialization in the s3c cpufreq driver (Arnd Bergmann). - Make the powernv cpuidle driver read target_residency values for idle states from a Device Tree (as we have the suitable DT bindings for that now) and improve the parsing of the powermgmt DT node in that driver (Preeti U Murthy)" * tag 'pm+acpi-3.20-rc1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: cpuidle: powernv: Avoid endianness conversions while parsing DT cpufreq: s3c: remove last use of resume_clocks callback cpufreq: s3c: remove incorrect __init annotations ACPI / LPSS: Deassert resets for SPI host controllers on Braswell ACPI / LPSS: Always disable I2C host controllers ACPI / resources: Change pr_info() to pr_debug() for debug information ACPI / video: Disable native backlight on Samsung Series 9 laptops cpuidle: powernv: Read target_residency value of idle states from DT if available Revert "ACPI / LPSS: Remove non-existing clock control from Intel Lynxpoint I2C" ACPI / EC: Remove non-standard log emphasis PNP: Switch from __check_region() to __request_region()
2015-02-21Merge tag 'clk-for-linus-3.20' of ↵Linus Torvalds1-1/+1
git://git.linaro.org/people/mike.turquette/linux Pull clock framework updates from Mike Turquette: "The clock framework changes contain the usual driver additions, enhancements and fixes mostly for ARM32, ARM64, MIPS and Power-based devices. Additionally the framework core underwent a bit of surgery with two major changes: - The boundary between the clock core and clock providers (e.g clock drivers) is now more well defined with dedicated provider helper functions. struct clk no longer maps 1:1 with the hardware clock but is a true per-user cookie which helps us tracker users of hardware clocks and debug bad behavior. - The addition of rate constraints for clocks. Rate ranges are now supported which are analogous to the voltage ranges in the regulator framework. Unfortunately these changes to the core created some breakeage. We think we fixed it all up but for this reason there are lots of last minute commits trying to undo the damage" * tag 'clk-for-linus-3.20' of git://git.linaro.org/people/mike.turquette/linux: (113 commits) clk: Only recalculate the rate if needed Revert "clk: mxs: Fix invalid 32-bit access to frac registers" clk: qoriq: Add support for the platform PLL powerpc/corenet: Enable CLK_QORIQ clk: Replace explicit clk assignment with __clk_hw_set_clk clk: Add __clk_hw_set_clk helper function clk: Don't dereference parent clock if is NULL MIPS: Alchemy: Remove bogus args from alchemy_clk_fgcs_detr clkdev: Always allocate a struct clk and call __clk_get() w/ CCF clk: shmobile: div6: Avoid division by zero in .round_rate() clk: mxs: Fix invalid 32-bit access to frac registers clk: omap: compile legacy omap3 clocks conditionally clkdev: Export clk_register_clkdev clk: Add rate constraints to clocks clk: remove clk-private.h pci: xgene: do not use clk-private.h arm: omap2+ remove dead clock code clk: Make clk API return per-user struct clk instances clk: tegra: Define PLLD_DSI and remove dsia(b)_mux clk: tegra: Add support for the Tegra132 CAR IP block ...
2015-02-21Merge branches 'pnp', 'pm-cpuidle' and 'pm-cpufreq'Rafael J. Wysocki2-11/+3
* pnp: PNP: Switch from __check_region() to __request_region() * pm-cpuidle: cpuidle: powernv: Avoid endianness conversions while parsing DT cpuidle: powernv: Read target_residency value of idle states from DT if available * pm-cpufreq: cpufreq: s3c: remove last use of resume_clocks callback cpufreq: s3c: remove incorrect __init annotations
2015-02-19Merge branch 'fixes' of ↵Linus Torvalds3-23/+63
git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal Pull more thermal managament updates from Zhang Rui: "Specifics: - Exynos thermal driver refactoring. Several cleanups, code optimization, unused symbols removal, and unused feature removal in Exynos thermal driver. Thanks Lukasz for this effort. - Exynos thermal driver support to OF thermal. After the code refactoring, the driver earned the support to OF thermal. Chip thermal data were moved from driver code to DTS, reducing the code footprint. Thanks Lukasz for this. - After receiving the OF thermal support, the exynos thermal driver now must allow modular build. Thanks Arnd for detecting, reporting and fixing this. - Exynos thermal driver support to Exynos 7 SoC. Thanks Abhilash for this. - Accurate temperature reporting on Rockchip thermal driver, thanks to Caesar. - Fix on how OF thermal enables its zones, thanks Lukasz for fixing. - Fixes in OF thermal examples under Documentation/. Thanks Srinivas for fixing" * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal: thermal: exynos: Add TMU support for Exynos7 SoC dts: Documentation: Add documentation for Exynos7 SoC thermal bindings cpufreq: exynos: allow modular build thermal: Fix examples in DT documentation thermal: exynos: Correct sanity check at exynos_report_trigger() function thermal: Kconfig: Remove config for not used EXYNOS_THERMAL_CORE thermal: exynos: Remove exynos_tmu_data.c file thermal: rockchip: make temperature reporting much more accurate thermal: exynos: Remove exynos_thermal_common.[c|h] files thermal: samsung: core: Exynos TMU rework to use device tree for configuration dts: Documentation: Update exynos-thermal.txt example for Exynos5440 dts: Documentation: Extending documentation entry for exynos-thermal cpufreq: exynos: Use device tree to determine if cpufreq cooling should be registered thermal: exynos: Modify exynos thermal code to use device tree for cpu cooling configuration thermal: exynos: Provide thermal_exynos.h file to be included in device tree files thermal: exynos: cosmetic: Correct comment format thermal: of: Enable thermal_zoneX when sensor is correctly added
2015-02-19cpufreq: s3c: remove last use of resume_clocks callbackArnd Bergmann1-8/+0
Commit 32726d2d550 ("ARM: SAMSUNG: Remove legacy clock code") already removed the callback pointer, but there was one remaining user: drivers/cpufreq/s3c24xx-cpufreq.c: In function 's3c_cpufreq_resume_clocks': drivers/cpufreq/s3c24xx-cpufreq.c:149:14: error: 'struct s3c_cpufreq_info' has no member named 'resume_clocks' cpu_cur.info->resume_clocks(); ^ Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: 32726d2d550 ("ARM: SAMSUNG: Remove legacy clock code") Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Cc: 3.17+ <stable@vger.kernel.org> # v3.17+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-19cpufreq: s3c: remove incorrect __init annotationsArnd Bergmann2-3/+3
The two functions s3c2416_cpufreq_driver_init and s3c_cpufreq_register are marked init but are called from a context that might be run after the __init sections are discarded, as the compiler points out: WARNING: vmlinux.o(.data+0x1ad9dc): Section mismatch in reference from the variable s3c2416_cpufreq_driver to the function .init.text:s3c2416_cpufreq_driver_init() WARNING: drivers/built-in.o(.text+0x35b5dc): Section mismatch in reference from the function s3c2410a_cpufreq_add() to the function .init.text:s3c_cpufreq_register() This removes the __init markings. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Cc: All applicable <stable@vger.kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-13Merge branches 'pm-cpufreq', 'pm-cpuidle', 'pm-devfreq', 'pm-opp' and 'pm-tools'Rafael J. Wysocki2-0/+15
* pm-cpufreq: cpufreq: speedstep-smi: enable interrupts when waiting * pm-cpuidle: intel_idle: support additional Broadwell model * pm-devfreq: PM / devfreq: event: testing the wrong variable * pm-opp: PM / OPP / clk: Remove unnecessary OOM message * pm-tools: tools/power turbostat: support additional Broadwell model tools/power turbostat: update parameters, documentation tools/power turbostat: Skip printing disabled package C-states
2015-02-12cpufreq: speedstep-smi: enable interrupts when waitingMikulas Patocka2-0/+15
On Dell Latitude C600 laptop with Pentium 3 850MHz processor, the speedstep-smi driver sometimes loads and sometimes doesn't load with "change to state X failed" message. The hardware sometimes refuses to change frequency and in this case, we need to retry later. I found out that we need to enable interrupts while waiting. When we enable interrupts, the hardware blockage that prevents frequency transition resolves and the transition is possible. With disabled interrupts, the blockage doesn't resolve (no matter how long do we wait). The exact reasons for this hardware behavior are unknown. This patch enables interrupts in the function speedstep_set_state that can be called with disabled interrupts. However, this function is called with disabled interrupts only from speedstep_get_freqs, so it shouldn't cause any problem. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com Cc: All applicable <stable@vger.kernel.org> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-10Merge tag 'pm+acpi-3.20-rc1' of ↵Linus Torvalds8-232/+367
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull ACPI and power management updates from Rafael Wysocki: "We have a few new features this time, including a new SFI-based cpufreq driver, a new devfreq driver for Tegra Activity Monitor, a new devfreq class for providing its governors with raw utilization data and a new ACPI driver for AMD SoCs. Still, the majority of changes here are reworks of existing code to make it more straightforward or to prepare it for implementing new features on top of it. The primary example is the rework of ACPI resources handling from Jiang Liu, Thomas Gleixner and Lv Zheng with support for IOAPIC hotplug implemented on top of it, but there is quite a number of changes of this kind in the cpufreq core, ACPICA, ACPI EC driver, ACPI processor driver and the generic power domains core code too. The most active developer is Viresh Kumar with his cpufreq changes. Specifics: - Rework of the core ACPI resources parsing code to fix issues in it and make using resource offsets more convenient and consolidation of some resource-handing code in a couple of places that have grown analagous data structures and code to cover the the same gap in the core (Jiang Liu, Thomas Gleixner, Lv Zheng). - ACPI-based IOAPIC hotplug support on top of the resources handling rework (Jiang Liu, Yinghai Lu). - ACPICA update to upstream release 20150204 including an interrupt handling rework that allows drivers to install raw handlers for ACPI GPEs which then become entirely responsible for the given GPE and the ACPICA core code won't touch it (Lv Zheng, David E Box, Octavian Purdila). - ACPI EC driver rework to fix several concurrency issues and other problems related to events handling on top of the ACPICA's new support for raw GPE handlers (Lv Zheng). - New ACPI driver for AMD SoCs analogous to the LPSS (Low-Power Subsystem) driver for Intel chips (Ken Xue). - Two minor fixes of the ACPI LPSS driver (Heikki Krogerus, Jarkko Nikula). - Two new blacklist entries for machines (Samsung 730U3E/740U3E and 510R) where the native backlight interface doesn't work correctly while the ACPI one does (Hans de Goede). - Rework of the ACPI processor driver's handling of idle states to make the code more straightforward and less bloated overall (Rafael J Wysocki). - Assorted minor fixes related to ACPI and SFI (Andreas Ruprecht, Andy Shevchenko, Hanjun Guo, Jan Beulich, Rafael J Wysocki, Yaowei Bai). - PCI core power management modification to avoid resuming (some) runtime-suspended devices during system suspend if they are in the right states already (Rafael J Wysocki). - New SFI-based cpufreq driver for Intel platforms using SFI (Srinidhi Kasagar). - cpufreq core fixes, cleanups and simplifications (Viresh Kumar, Doug Anderson, Wolfram Sang). - SkyLake CPU support and other updates for the intel_pstate driver (Kristen Carlson Accardi, Srinivas Pandruvada). - cpufreq-dt driver cleanup (Markus Elfring). - Init fix for the ARM big.LITTLE cpuidle driver (Sudeep Holla). - Generic power domains core code fixes and cleanups (Ulf Hansson). - Operating Performance Points (OPP) core code cleanups and kernel documentation update (Nishanth Menon). - New dabugfs interface to make the list of PM QoS constraints available to user space (Nishanth Menon). - New devfreq driver for Tegra Activity Monitor (Tomeu Vizoso). - New devfreq class (devfreq_event) to provide raw utilization data to devfreq governors (Chanwoo Choi). - Assorted minor fixes and cleanups related to power management (Andreas Ruprecht, Krzysztof Kozlowski, Rickard Strandqvist, Pavel Machek, Todd E Brandt, Wonhong Kwon). - turbostat updates (Len Brown) and cpupower Makefile improvement (Sriram Raghunathan)" * tag 'pm+acpi-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (151 commits) tools/power turbostat: relax dependency on APERF_MSR tools/power turbostat: relax dependency on invariant TSC Merge branch 'pci/host-generic' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci into acpi-resources tools/power turbostat: decode MSR_*_PERF_LIMIT_REASONS tools/power turbostat: relax dependency on root permission ACPI / video: Add disable_native_backlight quirk for Samsung 510R ACPI / PM: Remove unneeded nested #ifdef USB / PM: Remove unneeded #ifdef and associated dead code intel_pstate: provide option to only use intel_pstate with HWP ACPI / EC: Add GPE reference counting debugging messages ACPI / EC: Add query flushing support ACPI / EC: Refine command storm prevention support ACPI / EC: Add command flushing support. ACPI / EC: Introduce STARTED/STOPPED flags to replace BLOCKED flag ACPI: add AMD ACPI2Platform device support for x86 system ACPI / table: remove duplicate NULL check for the handler of acpi_table_parse() ACPI / EC: Update revision due to raw handler mode. ACPI / EC: Reduce ec_poll() by referencing the last register access timestamp. ACPI / EC: Fix several GPE handling issues by deploying ACPI_GPE_DISPATCH_RAW_HANDLER mode. ACPICA: Events: Enable APIs to allow interrupt/polling adaptive request based GPE handling model ...
2015-02-09Merge branch 'sfi' of ↵Rafael J. Wysocki3-0/+147
git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux into pm-cpufreq Pull SFI-based cpufreq driver for v3.20 from Len Brown. * 'sfi' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux: cpufreq: Add SFI based cpufreq driver support SFI: fix compiler warnings
2015-02-06intel_pstate: provide option to only use intel_pstate with HWPKristen Carlson Accardi1-0/+6
Allow users the option to disable the driver for any hardware which does not support HWP. Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-03cpufreq-dt: Drop unnecessary check before cpufreq_cooling_unregister() ↵Markus Elfring1-2/+1
invocation The cpufreq_cooling_unregister() function tests whether its argument is NULL and then returns immediately. Thus the test around the call is not needed. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> [ rjw: Subject ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-03cpufreq: Create for_each_governor()Viresh Kumar1-3/+7
To make code more readable and less error prone, lets create a helper macro for iterating over all available governors. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Saravana Kannan <skannan@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-03cpufreq: Create for_each_policy()Viresh Kumar1-5/+10
To make code more readable and less error prone, lets create a helper macro for iterating over all active policies. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-03cpufreq: Drop cpufreq_disabled() check from cpufreq_cpu_{get|put}()Viresh Kumar1-4/+1
When cpufreq is disabled, the per-cpu variable would have been set to NULL. Remove this unnecessary check. [ Changelog from Saravana Kannan. ] Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Saravana Kannan <skannan@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-03cpufreq: Set cpufreq_cpu_data to NULL before putting kobjectViresh Kumar1-3/+3
In __cpufreq_remove_dev_finish(), per-cpu 'cpufreq_cpu_data' needs to be cleared before calling kobject_put(&policy->kobj) and under cpufreq_driver_lock. Otherwise, if someone else calls cpufreq_cpu_get() in parallel with it, they can obtain a non-NULL policy from that after kobject_put(&policy->kobj) was executed. Consider this case: Thread A Thread B cpufreq_cpu_get() acquire cpufreq_driver_lock read-per-cpu cpufreq_cpu_data kobject_put(&policy->kobj); kobject_get(&policy->kobj); ... per_cpu(&cpufreq_cpu_data, cpu) = NULL And this will result in a warning like this one: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 4 at include/linux/kref.h:47 kobject_get+0x41/0x50() Modules linked in: acpi_cpufreq(+) nfsd auth_rpcgss nfs_acl lockd grace sunrpc xfs libcrc32c sd_mod ixgbe igb mdio ahci hwmon ... Call Trace: [<ffffffff81661b14>] dump_stack+0x46/0x58 [<ffffffff81072b61>] warn_slowpath_common+0x81/0xa0 [<ffffffff81072c7a>] warn_slowpath_null+0x1a/0x20 [<ffffffff812e16d1>] kobject_get+0x41/0x50 [<ffffffff815262a5>] cpufreq_cpu_get+0x75/0xc0 [<ffffffff81527c3e>] cpufreq_update_policy+0x2e/0x1f0 [<ffffffff810b8cb2>] ? up+0x32/0x50 [<ffffffff81381aa9>] ? acpi_ns_get_node+0xcb/0xf2 [<ffffffff81381efd>] ? acpi_evaluate_object+0x22c/0x252 [<ffffffff813824f6>] ? acpi_get_handle+0x95/0xc0 [<ffffffff81360967>] ? acpi_has_method+0x25/0x40 [<ffffffff81391e08>] acpi_processor_ppc_has_changed+0x77/0x82 [<ffffffff81089566>] ? move_linked_works+0x66/0x90 [<ffffffff8138e8ed>] acpi_processor_notify+0x58/0xe7 [<ffffffff8137410c>] acpi_ev_notify_dispatch+0x44/0x5c [<ffffffff8135f293>] acpi_os_execute_deferred+0x15/0x22 [<ffffffff8108c910>] process_one_work+0x160/0x410 [<ffffffff8108d05b>] worker_thread+0x11b/0x520 [<ffffffff8108cf40>] ? rescuer_thread+0x380/0x380 [<ffffffff81092421>] kthread+0xe1/0x100 [<ffffffff81092340>] ? kthread_create_on_node+0x1b0/0x1b0 [<ffffffff81669ebc>] ret_from_fork+0x7c/0xb0 [<ffffffff81092340>] ? kthread_create_on_node+0x1b0/0x1b0 ---[ end trace 89e66eb9795efdf7 ]--- The actual code flow is as follows: Thread A: Workqueue: kacpi_notify acpi_processor_notify() acpi_processor_ppc_has_changed() cpufreq_update_policy() cpufreq_cpu_get() kobject_get() Thread B: xenbus_thread() xenbus_thread() msg->u.watch.handle->callback() handle_vcpu_hotplug_event() vcpu_hotplug() cpu_down() __cpu_notify(CPU_POST_DEAD..) cpufreq_cpu_callback() __cpufreq_remove_dev_finish() cpufreq_policy_put_kobj() kobject_put() cpufreq_cpu_get() gets the policy from per-cpu variable cpufreq_cpu_data under cpufreq_driver_lock, and once it gets a valid policy it expects it to not be freed until cpufreq_cpu_put() is called. But the race happens when another thread puts the kobject first and updates cpufreq_cpu_data before or later. And so the first thread gets a valid policy structure and before it does kobject_get() on it, the second one has already done kobject_put(). Fix this by setting cpufreq_cpu_data to NULL before putting the kobject and that too under locks. Reported-by: Ethan Zhao <ethan.zhao@oracle.com> Reported-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Cc: 3.12+ <stable@vger.kernel.org> # 3.12+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-02Merge branch 'clk-next' into v3.19-rc7Michael Turquette1-1/+1
2015-01-31cpufreq: exynos: allow modular buildArnd Bergmann2-22/+31
The exynos cpufreq driver code recently gained a dependency on the cooling code, which may be a loadable module. This breaks an ARM allmodconfig build: drivers/built-in.o: In function `exynos_cpufreq_probe': :(.text+0x1748e8): undefined reference to `of_cpufreq_cooling_register' To avoid this problem, change cpufreq Kconfig to allow the drivers to be loadable modules as well and enforce a dependency on the thermal module. This change, in order to allow module builds on this cpufreq driver, properly constructs the driver into a single module, instead of several modules. The change also keeps the proper platform dependency, and therefore, it wont load in platforms that are not supposed to be loaded. The user will be able to build the support for all platforms, or select which platforms (s)he wants (as originally), except that now it can be a module, instead. Besides, it will still keep the driver only on those configs that expect it to be on. And it won't compile/load on platforms that it is not supposed to. It brings the config ARM_EXYNOS_CPU_FREQ_BOOST_SW closer to this driver, so it looks better in the menuconfig. We intentionally change ARM_EXYNOS5440_CPUFREQ to be tristate too, to avoid future troubles. Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: Kukjin Kim <kgene@kernel.org> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-pm@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Fixes: e725d26c4857 ("cpufreq: exynos: Use device tree to determine if cpufreq cooling should be registered") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
2015-01-30intel_pstate: honor user space min_perf_pct override on resumeKristen Carlson Accardi1-3/+11
If the user has requested an override of the min_perf_pct via sysfs, then it should be restored whenever policy is updated, such as on resume. Take the max of whatever the user requested and whatever the policy is. Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-30intel_pstate: respect cpufreq policy requestSrinivas Pandruvada1-1/+2
When thermal or other subsystem requests to change the policy, use that irrepective of whether cpufreq policy is PERFORMANCE or not. Without this change, when thermal subsystem passive policy wants to reduce performance, it still runs at 100%. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-30intel_pstate: Add num_pstates to sysfsKristen Carlson Accardi1-0/+13
Add a sysfs interface to display the total number of supported pstates. This value is independent of whether turbo has been enabled or disabled. Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-30intel_pstate: expose turbo range to sysfsKristen Carlson Accardi1-0/+18
This patch adds "turbo_pct" to the intel_pstate sysfs interface. turbo_pct will display the percentage of the total supported pstates that are in the turbo range. This value is independent of whether turbo has been disabled or not. Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-30intel_pstate: Add support for SkyLakeKristen Carlson Accardi1-0/+1
Add SKL cpuid. Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-24cpufreq: exynos: Use device tree to determine if cpufreq cooling should be ↵Lukasz Majewski1-1/+32
registered With thermal subsystem rework it is necessary to tune current cpufreq code to use cpu frequency change as a potential cooling device. Now the cpu cooling device is registered only when proper nodes and properties are available in device tree. Lack of them, however, will not prevent cpufreq for normal operation. Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
2015-01-23cpufreq: stats: drop unnecessary lockingViresh Kumar1-5/+1
There is no possibility of any race on updating last_index, trans_table or total_trans as these are updated only by cpufreq_stat_notifier_trans() which will be called sequentially. The only place where locking is still relevant is: cpufreq_stats_update(), which updates time_in_state and last_time. This can be called by two thread in parallel, that may result in races. The two threads being: - sysfs read of time_in_state - and frequency transition that calls cpufreq_stat_notifier_trans(). Remove locking from the first case mentioned above. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-23cpufreq: stats: don't update stats on false notifiersViresh Kumar1-2/+2
We need to call cpufreq_stats_update() to update 'time_in_state' for the last frequency. This is achieved by calling it from cpufreq_stat_notifier_trans(), which is called after frequency transition. But if we detect that the cpu's frequency haven't really changed and its a false POSTCHANGE notification, we don't really need to update time_in_state. It wouldn't cause any harm in calling cpufreq_stats_update() but we can avoid calling it here and call it when the frequency really changes. The result will be the same but more efficient. Reviewed-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-23cpufreq: stats: don't update stats from show_trans_table()Viresh Kumar1-1/+0
cpufreq_stats_update() updates time_in_state and nothing else. It should ideally be updated only in two cases: - User requested for the current value of time_in_state. - We have switched states and so need to update time for the last state. Currently, we are also doing this while user asks for the transition table of frequencies. It wouldn't do any harm, but no good as well. Its useless here. Remove it. Reviewed-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-23cpufreq: stats: time_in_state can't be NULL in cpufreq_stats_update()Viresh Kumar1-3/+1
'time_in_state' can't be NULL if 'stats' is valid. These are allocated together and only if time_in_state is allocated successfully, we update policy->stats. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-23cpufreq: stats: create sysfs group once we are readyViresh Kumar1-19/+25
Userspace is free to read value of any file from cpufreq/stats directory once they are created. __cpufreq_stats_create_table() is creating the sysfs files first and then allocating resources for them. Though it would be quite difficult to trigger the racy situation here, but for the sake of keeping sensible code lets create sysfs entries only after we are ready to go. This also does some makeup to the routine to make it look better. Reviewed-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-23cpufreq: remove CPUFREQ_UPDATE_POLICY_CPU notificationsViresh Kumar1-3/+0
CPUFREQ_UPDATE_POLICY_CPU notifications were used only from cpufreq-stats which doesn't use it anymore. Remove them. This also decrements values of other notification macros defined after CPUFREQ_UPDATE_POLICY_CPU by 1 to remove gaps. Hopefully all users are using macro's instead of direct numbers and so they wouldn't break as macro values are changed now. Reviewed-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-23cpufreq: stats: drop 'cpu' field of struct cpufreq_statsViresh Kumar1-12/+0
'cpu' field of struct cpufreq_stats isn't used anymore and so can be dropped. This change makes cpufreq_stats_update_policy_cpu() empty and so that is removed as well. Reviewed-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-23cpufreq: Remove (now) unused 'last_cpu' from struct cpufreq_policyViresh Kumar1-3/+0
'last_cpu' was used only from cpufreq-stats and isn't used anymore. Get rid of it. Reviewed-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-23cpufreq: stats: rename 'struct cpufreq_stats' objects as 'stats'Viresh Kumar1-51/+51
Currently we name objects of 'struct cpufreq_stats' as 'stat' and 'stats'. Use 'stats' to make it consistent. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-23cpufreq: stats: get rid of per-cpu cpufreq_stats_tableViresh Kumar1-33/+29
All CPUs sharing a cpufreq policy share stats too. For this reason, add a stats pointer to struct cpufreq_policy and drop per-CPU variable cpufreq_stats_table used for accessing cpufreq stats so as to reduce code complexity. Reviewed-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-23cpufreq: stats: pass 'stat' to cpufreq_stats_update()Viresh Kumar1-6/+4
It is better to pass a struct cpufreq_stats pointer to cpufreq_stats_update() instead of a CPU number, because that's all it needs. Even if we pass a cpu number to cpufreq_stats_update(), it reads the per-cpu variable to get 'stats' out of it. So we are doing these operations unnecessarily: - First getting the cpu number to pass to cpufreq_stats_update(), stat->cpu. - And then getting stats from the cpu, per_cpu(cpufreq_stats_table, cpu). Reviewed-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-01-23cpufreq: stats: don't check for freq table while freeing statsViresh Kumar1-2/+1
While we allocate stats, we do need to check if freq-table is present or not as we need to use it then. But while freeing stats, all we need to know is if stats holds a valid pointer value. There is no use of testing if cpufreq table is present or not. Don't check it. Reviewed-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>