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2021-09-07Merge tag 'mfd-next-5.15' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd Pull MFD updates from Lee Jones: "Core Frameworks: - Add support for registering devices via MFD cells to Simple MFD (I2C) New Drivers: - Add support for Renesas Synchronization Management Unit (SMU) New Device Support: - Add support for N5010 to Intel M10 BMC - Add support for Cannon Lake to Intel LPSS ACPI - Add support for Samsung SSG{1,2} to ST-Ericsson's U8500 family - Add support for TQMx110EB and TQMxE40x to TQ-Systems PLD TQMx86 New Functionality: - Add support for GPIO to Intel LPC ICH - Add support for Reset to Texas Instruments TPS65086 Fix-ups: - Trivial, sorting, whitespace, renaming, etc; mt6360-core, db8500-prcmu-regs, tqmx86 - Device Tree fiddling; syscon, axp20x, qcom,pm8008, ti,tps65086, brcm,cru - Use proper APIs for IRQ map resolution; ab8500-core, stmpe, tc3589x, wm8994-irq - Pass 'supplied-from' property through axp288_fuel_gauge via swnode - Remove unused file entry; MAINTAINERS - Make interrupt line optional; tps65086 - Rename db8500-cpuidle driver symbol; db8500-prcmu - Remove support for unused hardware; tqmx86 - Provide a standard LPC clock frequency for unknown boards; tqmx86 - Remove unused code; ti_am335x_tscadc - Use of_iomap() instead of ioremap(); syscon Bug Fixes: - Clear GPIO IRQ resource flags when no IRQ is set; tqmx86 - Fix incorrect/misleading frequencies; db8500-prcmu - Mitigate namespace clash with other GPIOBASE users" * tag 'mfd-next-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (31 commits) mfd: lpc_sch: Rename GPIOBASE to prevent build error mfd: syscon: Use of_iomap() instead of ioremap() dt-bindings: mfd: Add Broadcom CRU mfd: ti_am335x_tscadc: Delete superfluous error message mfd: tqmx86: Assume 24MHz LPC clock for unknown boards mfd: tqmx86: Add support for TQ-Systems DMI IDs mfd: tqmx86: Add support for TQMx110EB and TQMxE40x mfd: tqmx86: Fix typo in "platform" mfd: tqmx86: Remove incorrect TQMx90UC board ID mfd: tqmx86: Clear GPIO IRQ resource when no IRQ is set mfd: simple-mfd-i2c: Add support for registering devices via MFD cells mfd/cpuidle: ux500: Rename driver symbol mfd: tps65086: Add cell entry for reset driver mfd: tps65086: Make interrupt line optional dt-bindings: mfd: Convert tps65086.txt to YAML MAINTAINERS: Adjust ARM/NOMADIK/Ux500 ARCHITECTURES to file renaming mfd: db8500-prcmu: Handle missing FW variant mfd: db8500-prcmu: Rename register header mfd: axp20x: Add supplied-from property to axp288_fuel_gauge cell mfd: Don't use irq_create_mapping() to resolve a mapping ...
2021-09-03Merge tag 'powerpc-5.15-1' of ↵Linus Torvalds1-31/+46
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: - Convert pseries & powernv to use MSI IRQ domains. - Rework the pseries CPU numbering so that CPUs that are removed, and later re-added, are given a CPU number on the same node as previously, when possible. - Add support for a new more flexible device-tree format for specifying NUMA distances. - Convert powerpc to GENERIC_PTDUMP. - Retire sbc8548 and sbc8641d board support. - Various other small features and fixes. Thanks to Alexey Kardashevskiy, Aneesh Kumar K.V, Anton Blanchard, Cédric Le Goater, Christophe Leroy, Emmanuel Gil Peyrot, Fabiano Rosas, Fangrui Song, Finn Thain, Gautham R. Shenoy, Hari Bathini, Joel Stanley, Jordan Niethe, Kajol Jain, Laurent Dufour, Leonardo Bras, Lukas Bulwahn, Marc Zyngier, Masahiro Yamada, Michal Suchanek, Nathan Chancellor, Nicholas Piggin, Parth Shah, Paul Gortmaker, Pratik R. Sampat, Randy Dunlap, Sebastian Andrzej Siewior, Srikar Dronamraju, Wan Jiabing, Xiongwei Song, and Zheng Yongjun. * tag 'powerpc-5.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (154 commits) powerpc/bug: Cast to unsigned long before passing to inline asm powerpc/ptdump: Fix generic ptdump for 64-bit KVM: PPC: Fix clearing never mapped TCEs in realmode powerpc/pseries/iommu: Rename "direct window" to "dma window" powerpc/pseries/iommu: Make use of DDW for indirect mapping powerpc/pseries/iommu: Find existing DDW with given property name powerpc/pseries/iommu: Update remove_dma_window() to accept property name powerpc/pseries/iommu: Reorganize iommu_table_setparms*() with new helper powerpc/pseries/iommu: Add ddw_property_create() and refactor enable_ddw() powerpc/pseries/iommu: Allow DDW windows starting at 0x00 powerpc/pseries/iommu: Add ddw_list_new_entry() helper powerpc/pseries/iommu: Add iommu_pseries_alloc_table() helper powerpc/kernel/iommu: Add new iommu_table_in_use() helper powerpc/pseries/iommu: Replace hard-coded page shift powerpc/numa: Update cpu_cpu_map on CPU online/offline powerpc/numa: Print debug statements only when required powerpc/numa: convert printk to pr_xxx powerpc/numa: Drop dbg in favour of pr_debug powerpc/smp: Enable CACHE domain for shared processor powerpc/smp: Update cpu_core_map on all PowerPc systems ...
2021-08-16mfd/cpuidle: ux500: Rename driver symbolLinus Walleij1-1/+1
The PRCMU driver defines this as a DT node but there are no bindings for it and it needs no data from the device tree. Just spawn the device directly in the same way as the watchdog. Name it "db8500-cpuidle" since there are no ambitions to support any more SoCs than this one. This rids this annoying boot message: [ 0.032610] cpuidle-dbx500: Failed to locate of_node [id: 0] However I think the device still spawns and work just fine, despite not finding a device tree node. Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: linux-pm@vger.kernel.org Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2021-08-04cpuidle: pseries: Mark pseries_idle_proble() as __initNathan Chancellor1-1/+1
After commit 7cbd631d4dec ("cpuidle: pseries: Fixup CEDE0 latency only for POWER10 onwards"), pseries_idle_probe() is no longer inlined when compiling with clang, which causes a modpost warning: WARNING: modpost: vmlinux.o(.text+0xc86a54): Section mismatch in reference from the function pseries_idle_probe() to the function .init.text:fixup_cede0_latency() The function pseries_idle_probe() references the function __init fixup_cede0_latency(). This is often because pseries_idle_probe lacks a __init annotation or the annotation of fixup_cede0_latency is wrong. pseries_idle_probe() is a non-init function, which calls fixup_cede0_latency(), which is an init function, explaining the mismatch. pseries_idle_probe() is only called from pseries_processor_idle_init(), which is an init function, so mark pseries_idle_probe() as __init so there is no more warning. Fixes: 054e44ba99ae ("cpuidle: pseries: Add function to parse extended CEDE records") Signed-off-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210803211547.1093820-1-nathan@kernel.org
2021-08-03cpuidle: teo: Rename two local variables in teo_select()Rafael J. Wysocki1-7/+7
Rename two local variables in teo_select() so that their names better reflect their purpose. No functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-08-03cpuidle: teo: Fix alternative idle state lookupRafael J. Wysocki1-13/+27
There are three mistakes in the loop in teo_select() that is looking for an alternative candidate idle state. First, it should walk all of the idle states shallower than the current candidate one, including all of the disabled ones, but it terminates after the first enabled idle state. Second, it should not terminate its last step if idle state 0 is disabled (which is related to the first issue). Finally, it may return the current alternative candidate idle state prematurely if the time span criterion is not met by the idle state under consideration at the moment. To address the issues mentioned above, make the loop in question walk all of the idle states shallower than the current candidate idle state all the way down to idle state 0 and rearrange the checks in it. Fixes: 77577558f25d ("cpuidle: teo: Rework most recent idle duration values treatment") Reported-by: Doug Smythies <dsmythies@telus.net> Tested-by: Doug Smythies <dsmythies@telus.net> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-08-03cpuidle: pseries: Do not cap the CEDE0 latency in fixup_cede0_latency()Gautham R. Shenoy1-29/+30
Currently in fixup_cede0_latency() code, we perform the fixup the CEDE(0) exit latency value only if minimum advertized extended CEDE latency values are less than 10us. This was done so as to not break the expected behaviour on POWER8 platforms where the advertised latency was higher than the default 10us, which would delay the SMT folding on the core. However, after the earlier patch "cpuidle/pseries: Fixup CEDE0 latency only for POWER10 onwards", we can be sure that the fixup of CEDE0 latency is going to happen only from POWER10 onwards. Hence unconditionally use the minimum exit latency provided by the platform. Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1626676399-15975-3-git-send-email-ego@linux.vnet.ibm.com
2021-08-03cpuidle: pseries: Fixup CEDE0 latency only for POWER10 onwardsGautham R. Shenoy1-1/+15
Commit d947fb4c965c ("cpuidle: pseries: Fixup exit latency for CEDE(0)") sets the exit latency of CEDE(0) based on the latency values of the Extended CEDE states advertised by the platform On POWER9 LPARs, the firmwares advertise a very low value of 2us for CEDE1 exit latency on a Dedicated LPAR. The latency advertized by the PHYP hypervisor corresponds to the latency required to wakeup from the underlying hardware idle state. However the wakeup latency from the LPAR perspective should include 1. The time taken to transition the CPU from the Hypervisor into the LPAR post wakeup from platform idle state 2. Time taken to send the IPI from the source CPU (waker) to the idle target CPU (wakee). 1. can be measured via timer idle test, where we queue a timer, say for 1ms, and enter the CEDE state. When the timer fires, in the timer handler we compute how much extra timer over the expected 1ms have we consumed. On a a POWER9 LPAR the numbers are CEDE latency measured using a timer (numbers in ns) N Min Median Avg 90%ile 99%ile Max Stddev 400 2601 5677 5668.74 5917 6413 9299 455.01 1. and 2. combined can be determined by an IPI latency test where we send an IPI to an idle CPU and in the handler compute the time difference between when the IPI was sent and when the handler ran. We see the following numbers on POWER9 LPAR. CEDE latency measured using an IPI (numbers in ns) N Min Median Avg 90%ile 99%ile Max Stddev 400 711 7564 7369.43 8559 9514 9698 1200.01 Suppose, we consider the 99th percentile latency value measured using the IPI to be the wakeup latency, the value would be 9.5us This is in the ballpark of the default value of 10us. Hence, use the exit latency of CEDE(0) based on the latency values advertized by platform only from POWER10 onwards. The values advertized on POWER10 platforms is more realistic and informed by the latency measurements. For earlier platforms stick to the default value of 10us. The fix was suggested by Michael Ellerman. Fixes: d947fb4c965c ("cpuidle: pseries: Fixup exit latency for CEDE(0)") Reported-by: Enrico Joedecke <joedecke@de.ibm.com> Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1626676399-15975-2-git-send-email-ego@linux.vnet.ibm.com
2021-06-30Merge tag 'cpuidle-v5.14-rc1' of ↵Rafael J. Wysocki1-0/+14
https://git.linaro.org/people/daniel.lezcano/linux Pull ARM cpuidle updates for v5.14 from Daniel Lezcano: "- Add support for Qcom MSM8226 (Bartosz Dudziak)" * tag 'cpuidle-v5.14-rc1' of https://git.linaro.org/people/daniel.lezcano/linux: cpuidle: qcom: Add SPM register data for MSM8226 dt-bindings: arm: msm: Add SAW2 for MSM8226
2021-06-29Merge tag 'pm-5.14-rc1' of ↵Linus Torvalds1-228/+248
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull power management updates from Rafael Wysocki: "These add hybrid processors support to the intel_pstate driver and make it work with more processor models when HWP is disabled, make the intel_idle driver use special C6 idle state paremeters when package C-states are disabled, add cooling support to the tegra30 devfreq driver, rework the TEO (timer events oriented) cpuidle governor, extend the OPP (operating performance points) framework to use the required-opps DT property in more cases, fix some issues and clean up a number of assorted pieces of code. Specifics: - Make intel_pstate support hybrid processors using abstract performance units in the HWP interface (Rafael Wysocki). - Add Icelake servers and Cometlake support in no-HWP mode to intel_pstate (Giovanni Gherdovich). - Make cpufreq_online() error path be consistent with the CPU device removal path in cpufreq (Rafael Wysocki). - Clean up 3 cpufreq drivers and the statistics code (Hailong Liu, Randy Dunlap, Shaokun Zhang). - Make intel_idle use special idle state parameters for C6 when package C-states are disabled (Chen Yu). - Rework the TEO (timer events oriented) cpuidle governor to address some theoretical shortcomings in it (Rafael Wysocki). - Drop unneeded semicolon from the TEO governor (Wan Jiabing). - Modify the runtime PM framework to accept unassigned suspend and resume callback pointers (Ulf Hansson). - Improve pm_runtime_get_sync() documentation (Krzysztof Kozlowski). - Improve device performance states support in the generic power domains (genpd) framework (Ulf Hansson). - Fix some documentation issues in genpd (Yang Yingliang). - Make the operating performance points (OPP) framework use the required-opps DT property in use cases that are not related to genpd (Hsin-Yi Wang). - Make lazy_link_required_opp_table() use list_del_init instead of list_del/INIT_LIST_HEAD (Yang Yingliang). - Simplify wake IRQs handling in the core system-wide sleep support code and clean up some coding style inconsistencies in it (Tian Tao, Zhen Lei). - Add cooling support to the tegra30 devfreq driver and improve its DT bindings (Dmitry Osipenko). - Fix some assorted issues in the devfreq core and drivers (Chanwoo Choi, Dong Aisheng, YueHaibing)" * tag 'pm-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (39 commits) PM / devfreq: passive: Fix get_target_freq when not using required-opp cpufreq: Make cpufreq_online() call driver->offline() on errors opp: Allow required-opps to be used for non genpd use cases cpuidle: teo: remove unneeded semicolon in teo_select() dt-bindings: devfreq: tegra30-actmon: Add cooling-cells dt-bindings: devfreq: tegra30-actmon: Convert to schema PM / devfreq: userspace: Use DEVICE_ATTR_RW macro PM: runtime: Clarify documentation when callbacks are unassigned PM: runtime: Allow unassigned ->runtime_suspend|resume callbacks PM: runtime: Improve path in rpm_idle() when no callback PM: hibernate: remove leading spaces before tabs PM: sleep: remove trailing spaces and tabs PM: domains: Drop/restore performance state votes for devices at runtime PM PM: domains: Return early if perf state is already set for the device PM: domains: Split code in dev_pm_genpd_set_performance_state() cpuidle: teo: Use kerneldoc documentation in admin-guide cpuidle: teo: Rework most recent idle duration values treatment cpuidle: teo: Change the main idle state selection logic cpuidle: teo: Cosmetic modification of teo_select() cpuidle: teo: Cosmetic modifications of teo_update() ...
2021-06-17cpuidle: teo: remove unneeded semicolon in teo_select()Wan Jiabing1-1/+1
Fix following coccicheck warning: drivers/cpuidle/governors/teo.c:315:10-11: Unneeded semicolon Signed-off-by: Wan Jiabing <wanjiabing@vivo.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-06-16cpuidle: qcom: Add SPM register data for MSM8226Bartosz Dudziak1-0/+14
Add MSM8226 register data to SPM AVS Wrapper 2 (SAW2) power controller driver. Reviewed-by: Stephan Gerhold <stephan@gerhold.net> Signed-off-by: Bartosz Dudziak <bartosz.dudziak@snejp.pl> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20210612205335.9730-3-bartosz.dudziak@snejp.pl
2021-06-11cpuidle: teo: Use kerneldoc documentation in admin-guideRafael J. Wysocki1-4/+8
There are two descriptions of the TEO (Timer Events Oriented) cpuidle governor in the kernel source tree, one in the C file containing its code and one in cpuidle.rst which is part of admin-guide. Instead of trying to keep them both in sync and in order to reduce text duplication, include the governor description from the C file directly into cpuidle.rst. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-06-11cpuidle: teo: Rework most recent idle duration values treatmentRafael J. Wysocki1-83/+70
The TEO (Timer Events Oriented) cpuidle governor uses several most recent idle duration values for a given CPU to refine the idle state selection in case the previous long-term trends have not been followed recently and a new trend appears to be forming. That is done by computing the average of the most recent idle duration values falling below the time till the next timer event ("sleep length"), provided that they are the majority of the most recent idle duration values taken into account, and using it as the new expected idle duration value. However, idle state selection based on that value may not be optimal, because the average does not really indicate which of the idle states with target residencies less than or equal to it is likely to be the best fit. Thus, instead of computing the average, make the governor carry out computations based on the distribution of the most recent idle duration values among the bins corresponding to different idle states. Namely, if the majority of the most recent idle duration values taken into consideration are less than the current sleep length (which means that the CPU is likely to wake up early), find the idle state closest to the "candidate" one "matching" the sleep length whose target residency is less than or equal to the majority of the most recent idle duration values that have fallen below the current sleep length (which means that it is likely to be "shallow enough" this time). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-06-11cpuidle: teo: Change the main idle state selection logicRafael J. Wysocki1-168/+200
Two aspects of the current main idle state selection logic in the TEO (Timer Events Oriented) cpuidle governor are quite questionable. First of all, the "hits" and "misses" metrics used by it are only updated for a given idle state if the time till the next timer event ("sleep length") is between the target residency of that state and the target residency of the next one. Consequently, they are likely to become stale if the sleep length tends to fall outside that interval which increases the likelihood of subomtimal idle state selection. Second, the decision on whether or not to select the idle state "matching" the sleep length is based on the metrics collected for that state alone, whereas in principle the metrics collected for the other idle states should be taken into consideration when that decision is made. For example, if the measured idle duration is less than the target residency of the idle state "matching" the sleep length, then it is also less than the target residency of any deeper idle state and that should be taken into account when considering whether or not to select any of those states, but currently it is not. In order to address the above shortcomings, modify the main idle state selection logic in the TEO governor to take the metrics collected for all of the idle states into account when deciding whether or not to select the one "matching" the sleep length. Moreover, drop the "misses" metric that becomes redundant after the above change and rename the "early_hits" metric to "intercepts" so that its role is better reflected by its name (the idea being that if a CPU wakes up earlier than indicated by the sleep length, then it must be a result of a non-timer interrupt that "intercepts" the CPU). Also rename the states[] array in struct struct teo_cpu to state_bins[] to avoid confusing it with the states[] array in struct cpuidle_driver and update the documentation to match the new code (and make it more comprehensive while at it). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-06-11cpuidle: teo: Cosmetic modification of teo_select()Rafael J. Wysocki1-11/+7
Initialize local variables in teo_select() where they are declared. No functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-06-11cpuidle: teo: Cosmetic modifications of teo_update()Rafael J. Wysocki1-6/+7
Rename a local variable in teo_update() so that its purpose is better reflected by its name and use one more local variable in the loop over the CPU idle states in that function to make the code somewhat easier to read. No functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-05-12sched: Make nr_iowait_cpu() return 32-bit valueAlexey Dobriyan1-3/+3
Runqueue ->nr_iowait counters are 32-bit anyway. Propagate 32-bitness into other code, but don't try too hard. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210422200228.1423391-3-adobriyan@gmail.com
2021-04-08Merge back earlier cpuidle updates for v5.13.Rafael J. Wysocki3-30/+45
2021-04-08cpuidle: Fix ARM_QCOM_SPM_CPUIDLE configurationHe Ying1-1/+1
When CONFIG_ARM_QCOM_SPM_CPUIDLE is y and CONFIG_MMU is not set, compiling errors are encountered as follows: drivers/cpuidle/cpuidle-qcom-spm.o: In function `spm_dev_probe': cpuidle-qcom-spm.c:(.text+0x140): undefined reference to `cpu_resume_arm' cpuidle-qcom-spm.c:(.text+0x148): undefined reference to `cpu_resume_arm' Note that cpu_resume_arm is defined when MMU is set. So, add dependency on MMU in ARM_QCOM_SPM_CPUIDLE configuration. Fixes: a871be6b8eee ("cpuidle: Convert Qualcomm SPM driver to a generic CPUidle driver") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: He Ying <heying24@huawei.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20210406123328.92904-1-heying24@huawei.com
2021-04-08cpuidle: tegra: Remove do_idle firmware callDmitry Osipenko1-12/+1
The do_idle firmware call is unused by all Tegra SoCs, hence remove it in order to keep driver's code clean. Tested-by: Anton Bambura <jenneron@protonmail.com> # TF701 T114 Tested-by: Matt Merhar <mattmerhar@protonmail.com> # Ouya T30 Tested-by: Peter Geis <pgwipeout@gmail.com> # Ouya T30 Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20210302095405.28453-2-digetx@gmail.com
2021-04-08cpuidle: tegra: Fix C7 idling state on Tegra114Dmitry Osipenko1-6/+6
Trusted Foundation firmware doesn't implement the do_idle call and in this case suspending should fall back to the common suspend path. In order to fix this issue we will unconditionally set the NOFLUSH_L2 mode via firmware call, which is a NO-OP on Tegra30/124, and then proceed to the C7 idling, like it was done by the older Tegra114 cpuidle driver. Fixes: 14e086baca50 ("cpuidle: tegra: Squash Tegra114 driver into the common driver") Cc: stable@vger.kernel.org # 5.7+ Reported-by: Anton Bambura <jenneron@protonmail.com> # TF701 T114 Tested-by: Anton Bambura <jenneron@protonmail.com> # TF701 T114 Tested-by: Matt Merhar <mattmerhar@protonmail.com> # Ouya T30 Tested-by: Peter Geis <pgwipeout@gmail.com> # Ouya T30 Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20210302095405.28453-1-digetx@gmail.com
2021-04-07cpuidle: menu: Take negative "sleep length" values into accountRafael J. Wysocki1-6/+11
Make the menu governor check the tick_nohz_get_next_hrtimer() return value so as to avoid dealing with negative "sleep length" values and make it use that value directly when the tick is stopped. While at it, rename local variable delta_next in menu_select() to delta_tick which better reflects its purpose. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-04-07cpuidle: teo: Take negative "sleep length" values into accountRafael J. Wysocki1-7/+15
Modify the TEO governor to take possible negative return values of tick_nohz_get_next_hrtimer() into account by changing the data type of some variables used by it to s64 which allows it to carry out computations without potentially problematic data type conversions into u64. Also change the computations in teo_select() so that the negative values themselves are handled in a natural way to avoid adding extra negative value checks to that function. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-04-07cpuidle: teo: Adjust handling of very short idle timesRafael J. Wysocki1-17/+15
If the time till the next timer event is shorter than the target residency of the first idle state (state 0), the TEO governor does not update its metrics for any idle states, but arguably it should record a "hit" for idle state 0 in that case, so modify it to do that. Accordingly, also make it record an "early hit" for idle state 0 if the measured idle duration is less than its target residency, which allows one branch more to be dropped from teo_update(). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-04-07cpuidle: Use s64 as exit_latency_ns and target_residency_ns data typeRafael J. Wysocki1-0/+4
Subsequent changes will cause the exit_latency_ns and target_residency_ns fields in struct cpuidle_state to be used in computations in which data type conversions to u64 may turn a negative number close to zero into a verly large positive number leading to incorrect results. In preparation for that, change the data type of the fields mentioned above to s64, but ensure that they will not be negative themselves. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-17Merge tag 'arm-soc-drivers-5.11' of ↵Linus Torvalds1-2/+1
git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc Pull ARM SoC driver updates from Arnd Bergmann: "There are a couple of subsystems maintained by other people that merge their drivers through the SoC tree, those changes include: - The SCMI firmware framework gains support for sensor notifications and for controlling voltage domains. - A large update for the Tegra memory controller driver, integrating it better with the interconnect framework - The memory controller subsystem gains support for Mediatek MT8192 - The reset controller framework gains support for sharing pulsed resets For Soc specific drivers in drivers/soc, the main changes are - The Allwinner/sunxi MBUS gets a rework for the way it handles dma_map_ops and offsets between physical and dma address spaces. - An errata fix plus some cleanups for Freescale Layerscape SoCs - A cleanup for renesas drivers regarding MMIO accesses. - New SoC specific drivers for Mediatek MT8192 and MT8183 power domains - New SoC specific drivers for Aspeed AST2600 LPC bus control and SoC identification. - Core Power Domain support for Qualcomm MSM8916, MSM8939, SDM660 and SDX55. - A rework of the TI AM33xx 'genpd' power domain support to use information from DT instead of platform data - Support for TI AM64x SoCs - Allow building some Amlogic drivers as modules instead of built-in Finally, there are numerous cleanups and smaller bug fixes for Mediatek, Tegra, Samsung, Qualcomm, TI OMAP, Amlogic, Rockchips, Renesas, and Xilinx SoCs" * tag 'arm-soc-drivers-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (222 commits) soc: mediatek: mmsys: Specify HAS_IOMEM dependency for MTK_MMSYS firmware: xilinx: Properly align function parameter firmware: xilinx: Add a blank line after function declaration firmware: xilinx: Remove additional newline firmware: xilinx: Fix kernel-doc warnings firmware: xlnx-zynqmp: fix compilation warning soc: xilinx: vcu: add missing register NUM_CORE soc: xilinx: vcu: use vcu-settings syscon registers dt-bindings: soc: xlnx: extract xlnx, vcu-settings to separate binding soc: xilinx: vcu: drop useless success message clk: samsung: mark PM functions as __maybe_unused soc: samsung: exynos-chipid: initialize later - with arch_initcall soc: samsung: exynos-chipid: order list of SoCs by name memory: jz4780_nemc: Fix potential NULL dereference in jz4780_nemc_probe() memory: ti-emif-sram: only build for ARMv7 memory: tegra30: Support interconnect framework memory: tegra20: Support hardware versioning and clean up OPP table initialization dt-bindings: memory: tegra20-emc: Document opp-supported-hw property soc: rockchip: io-domain: Fix error return code in rockchip_iodomain_probe() reset-controller: ti: force the write operation when assert or deassert ...
2020-12-16Merge tag 'pm-5.11-rc1' of ↵Linus Torvalds3-6/+55
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull power management updates from Rafael Wysocki: "These update cpufreq (core and drivers), cpuidle (polling state implementation and the PSCI driver), the OPP (operating performance points) framework, devfreq (core and drivers), the power capping RAPL (Running Average Power Limit) driver, the Energy Model support, the generic power domains (genpd) framework, the ACPI device power management, the core system-wide suspend code and power management utilities. Specifics: - Use local_clock() instead of jiffies in the cpufreq statistics to improve accuracy (Viresh Kumar). - Fix up OPP usage in the cpufreq-dt and qcom-cpufreq-nvmem cpufreq drivers (Viresh Kumar). - Clean up the cpufreq core, the intel_pstate driver and the schedutil cpufreq governor (Rafael Wysocki). - Fix up error code paths in the sti-cpufreq and mediatek cpufreq drivers (Yangtao Li, Qinglang Miao). - Fix cpufreq_online() to return error codes instead of success (0) in all cases when it fails (Wang ShaoBo). - Add mt8167 support to the mediatek cpufreq driver and blacklist mt8516 in the cpufreq-dt-platdev driver (Fabien Parent). - Modify the tegra194 cpufreq driver to always return values from the frequency table as the current frequency and clean up that driver (Sumit Gupta, Jon Hunter). - Modify the arm_scmi cpufreq driver to allow it to discover the power scale present in the performance protocol and provide this information to the Energy Model (Lukasz Luba). - Add missing MODULE_DEVICE_TABLE to several cpufreq drivers (Pali Rohár). - Clean up the CPPC cpufreq driver (Ionela Voinescu). - Fix NVMEM_IMX_OCOTP dependency in the imx cpufreq driver (Arnd Bergmann). - Rework the poling interval selection for the polling state in cpuidle (Mel Gorman). - Enable suspend-to-idle for PSCI OSI mode in the PSCI cpuidle driver (Ulf Hansson). - Modify the OPP framework to support empty (node-less) OPP tables in DT for passing dependency information (Nicola Mazzucato). - Fix potential lockdep issue in the OPP core and clean up the OPP core (Viresh Kumar). - Modify dev_pm_opp_put_regulators() to accept a NULL argument and update its users accordingly (Viresh Kumar). - Add frequency changes tracepoint to devfreq (Matthias Kaehlcke). - Add support for governor feature flags to devfreq, make devfreq sysfs file permissions depend on the governor and clean up the devfreq core (Chanwoo Choi). - Clean up the tegra20 devfreq driver and deprecate it to allow another driver based on EMC_STAT to be used instead of it (Dmitry Osipenko). - Add interconnect support to the tegra30 devfreq driver, allow it to take the interconnect and OPP information from DT and clean it up (Dmitry Osipenko). - Add interconnect support to the exynos-bus devfreq driver along with interconnect properties documentation (Sylwester Nawrocki). - Add suport for AMD Fam17h and Fam19h processors to the RAPL power capping driver (Victor Ding, Kim Phillips). - Fix handling of overly long constraint names in the powercap framework (Lukasz Luba). - Fix the wakeup configuration handling for bridges in the ACPI device power management core (Rafael Wysocki). - Add support for using an abstract scale for power units in the Energy Model (EM) and document it (Lukasz Luba). - Add em_cpu_energy() micro-optimization to the EM (Pavankumar Kondeti). - Modify the generic power domains (genpd) framwework to support suspend-to-idle (Ulf Hansson). - Fix creation of debugfs nodes in genpd (Thierry Strudel). - Clean up genpd (Lina Iyer). - Clean up the core system-wide suspend code and make it print driver flags for devices with debug enabled (Alex Shi, Patrice Chotard, Chen Yu). - Modify the ACPI system reboot code to make it prepare for system power off to avoid confusing the platform firmware (Kai-Heng Feng). - Update the pm-graph (multiple changes, mostly usability-related) and cpupower (online and offline CPU information support) PM utilities (Todd Brandt, Brahadambal Srinivasan)" * tag 'pm-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (86 commits) cpufreq: Fix cpufreq_online() return value on errors cpufreq: Fix up several kerneldoc comments cpufreq: stats: Use local_clock() instead of jiffies cpufreq: schedutil: Simplify sugov_update_next_freq() cpufreq: intel_pstate: Simplify intel_cpufreq_update_pstate() PM: domains: create debugfs nodes when adding power domains opp: of: Allow empty opp-table with opp-shared dt-bindings: opp: Allow empty OPP tables media: venus: dev_pm_opp_put_*() accepts NULL argument drm/panfrost: dev_pm_opp_put_*() accepts NULL argument drm/lima: dev_pm_opp_put_*() accepts NULL argument PM / devfreq: exynos: dev_pm_opp_put_*() accepts NULL argument cpufreq: qcom-cpufreq-nvmem: dev_pm_opp_put_*() accepts NULL argument cpufreq: dt: dev_pm_opp_put_regulators() accepts NULL argument opp: Allow dev_pm_opp_put_*() APIs to accept NULL opp_table opp: Don't create an OPP table from dev_pm_opp_get_opp_table() cpufreq: dt: Don't (ab)use dev_pm_opp_get_opp_table() to create OPP table opp: Reduce the size of critical section in _opp_kref_release() PM / EM: Micro optimization in em_cpu_energy cpufreq: arm_scmi: Discover the power scale in performance protocol ...
2020-12-01cpuidle: Select polling interval based on a c-state with a longer target ↵Mel Gorman1-2/+23
residency It was noted that a few workloads that idle rapidly regressed when commit 36fcb4292473 ("cpuidle: use first valid target residency as poll time") was merged. The workloads in question were heavy communicators that idle rapidly and were impacted by the c-state exit latency as the active CPUs were not polling at the time of wakeup. As they were not particularly realistic workloads, it was not considered to be a major problem. Unfortunately, a bug was reported for a real workload in a production environment that relied on large numbers of threads operating in a worker pool pattern. These threads would idle for periods of time longer than the C1 target residency and so incurred the c-state exit latency penalty. The application is very sensitive to wakeup latency and indirectly relying on behaviour prior to commit on a37b969a61c1 ("cpuidle: poll_state: Add time limit to poll_idle()") to poll for long enough to avoid the exit latency cost. The target residency of C1 is typically very short. On some x86 machines, it can be as low as 2 microseconds. In poll_idle(), the clock is checked every POLL_IDLE_RELAX_COUNT interations of cpu_relax() and even one iteration of that loop can be over 1 microsecond so the polling interval is very close to the granularity of what poll_idle() can detect. Furthermore, a basic ping pong workload like perf bench pipe has a longer round-trip time than the 2 microseconds meaning that the CPU will almost certainly not be polling when the ping-pong completes. This patch selects a polling interval based on an enabled c-state that has an target residency longer than 10usec. If there is no enabled-cstate then polling will be up to a TICK_NSEC/16 similar to what it was up until kernel 4.20. Polling for a full tick is unlikely (rescheduling event) and is much longer than the existing target residencies for a deep c-state. As an example, consider a CPU with the following c-state information from an Intel CPU; residency exit_latency C1 2 2 C1E 20 10 C3 100 33 C6 400 133 The polling interval selected is 20usec. If booted with intel_idle.max_cstate=1 then the polling interval is 250usec as the deeper c-states were not available. On an AMD EPYC machine, the c-state information is more limited and looks like residency exit_latency C1 2 1 C2 800 400 The polling interval selected is 250usec. While C2 was considered, the polling interval was clamped by CPUIDLE_POLL_MAX. Note that it is not expected that polling will be a universal win. As well as potentially trading power for performance, the performance is not guaranteed if the extra polling prevented a turbo state being reached. Making it a tunable was considered but it's driver-specific, may be overridden by a governor and is not a guaranteed polling interval making it difficult to describe without knowledge of the implementation. tbench4 vanilla polling Hmean 1 497.89 ( 0.00%) 543.15 * 9.09%* Hmean 2 975.88 ( 0.00%) 1059.73 * 8.59%* Hmean 4 1953.97 ( 0.00%) 2081.37 * 6.52%* Hmean 8 3645.76 ( 0.00%) 4052.95 * 11.17%* Hmean 16 6882.21 ( 0.00%) 6995.93 * 1.65%* Hmean 32 10752.20 ( 0.00%) 10731.53 * -0.19%* Hmean 64 12875.08 ( 0.00%) 12478.13 * -3.08%* Hmean 128 21500.54 ( 0.00%) 21098.60 * -1.87%* Hmean 256 21253.70 ( 0.00%) 21027.18 * -1.07%* Hmean 320 20813.50 ( 0.00%) 20580.64 * -1.12%* Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-11-27Merge branch 'linus' into sched/core, to resolve semantic conflictIngo Molnar1-2/+2
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2020-11-24smp: Cleanup smp_call_function*()Peter Zijlstra1-2/+1
Get rid of the __call_single_node union and cleanup the API a little to avoid external code relying on the structure layout as much. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
2020-11-23Merge back cpuidle changes for v5.11.Rafael J. Wysocki2-4/+32
2020-11-16cpuidle: tegra: Annotate tegra_pm_set_cpu_in_lp2() with RCU_NONIDLEDmitry Osipenko1-2/+2
Annotate tegra_pm_set[clear]_cpu_in_lp2() with RCU_NONIDLE in order to fix lockdep warning about suspicious RCU usage of a spinlock during late idling phase. WARNING: suspicious RCU usage ... include/trace/events/lock.h:13 suspicious rcu_dereference_check() usage! ... (dump_stack) from (lock_acquire) (lock_acquire) from (_raw_spin_lock) (_raw_spin_lock) from (tegra_pm_set_cpu_in_lp2) (tegra_pm_set_cpu_in_lp2) from (tegra_cpuidle_enter) (tegra_cpuidle_enter) from (cpuidle_enter_state) (cpuidle_enter_state) from (cpuidle_enter_state_coupled) (cpuidle_enter_state_coupled) from (cpuidle_enter) (cpuidle_enter) from (do_idle) ... Tested-by: Peter Geis <pgwipeout@gmail.com> Reported-by: Peter Geis <pgwipeout@gmail.com> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-11-10cpuidle: psci: Enable suspend-to-idle for PSCI OSI modeUlf Hansson2-4/+32
To select domain idlestates for cpuidle-psci when OSI mode has been enabled, the PM domains via genpd are being managed through runtime PM. This works fine for the regular idlepath, but it doesn't during system wide suspend. More precisely, the domain idlestates becomes temporarily disabled, which is because the PM core disables runtime PM for devices during system wide suspend. Later in the system suspend phase, genpd intends to deal with this from its ->suspend_noirq() callback, but this doesn't work as expected for a device corresponding to a CPU, because the domain idlestates needs to be selected on a per CPU basis (the PM core doesn't invoke the callbacks like that). To address this problem, let's enable the syscore flag for the corresponding CPU device that becomes successfully attached to its PM domain (applicable only in OSI mode). This informs the PM core to skip invoke the system wide suspend/resume callbacks for the device, thus also prevents genpd from screwing up its internal state of it. Moreover, to properly select a domain idlestate for the CPUs during suspend-to-idle, let's assign a specific ->enter_s2idle() callback for the corresponding domain idlestate (applicable only in OSI mode). From that callback, let's invoke dev_pm_genpd_suspend|resume(), as this allows a domain idlestate to be selected for the current CPU by genpd. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-10-26cpuidle: big.LITTLE: enable driver only on Peach-Pit/Pi ChromebooksMarek Szyprowski1-2/+1
This driver always worked properly only on the Exynos 5420/5800 based Chromebooks (Peach-Pit/Pi), so change the required compatible string to the 'google,peach', to avoid enabling it on the other Exynos 542x/5800 boards, which hangs in such case. The main difference between Peach-Pit/Pi and other Exynos 542x/5800 boards is the firmware - Peach platform doesn't use secure firmware at all. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
2020-10-16Merge tag 'powerpc-5.10-1' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: - A series from Nick adding ARCH_WANT_IRQS_OFF_ACTIVATE_MM & selecting it for powerpc, as well as a related fix for sparc. - Remove support for PowerPC 601. - Some fixes for watchpoints & addition of a new ptrace flag for detecting ISA v3.1 (Power10) watchpoint features. - A fix for kernels using 4K pages and the hash MMU on bare metal Power9 systems with > 16TB of RAM, or RAM on the 2nd node. - A basic idle driver for shallow stop states on Power10. - Tweaks to our sched domains code to better inform the scheduler about the hardware topology on Power9/10, where two SMT4 cores can be presented by firmware as an SMT8 core. - A series doing further reworks & cleanups of our EEH code. - Addition of a filter for RTAS (firmware) calls done via sys_rtas(), to prevent root from overwriting kernel memory. - Other smaller features, fixes & cleanups. Thanks to: Alexey Kardashevskiy, Andrew Donnellan, Aneesh Kumar K.V, Athira Rajeev, Biwen Li, Cameron Berkenpas, Cédric Le Goater, Christophe Leroy, Christoph Hellwig, Colin Ian King, Daniel Axtens, David Dai, Finn Thain, Frederic Barrat, Gautham R. Shenoy, Greg Kurz, Gustavo Romero, Ira Weiny, Jason Yan, Joel Stanley, Jordan Niethe, Kajol Jain, Konrad Rzeszutek Wilk, Laurent Dufour, Leonardo Bras, Liu Shixin, Luca Ceresoli, Madhavan Srinivasan, Mahesh Salgaonkar, Nathan Lynch, Nicholas Mc Guire, Nicholas Piggin, Nick Desaulniers, Oliver O'Halloran, Pedro Miraglia Franco de Carvalho, Pratik Rajesh Sampat, Qian Cai, Qinglang Miao, Ravi Bangoria, Russell Currey, Satheesh Rajendran, Scott Cheloha, Segher Boessenkool, Srikar Dronamraju, Stan Johnson, Stephen Kitt, Stephen Rothwell, Thiago Jung Bauermann, Tyrel Datwyler, Vaibhav Jain, Vaidyanathan Srinivasan, Vasant Hegde, Wang Wensheng, Wolfram Sang, Yang Yingliang, zhengbin. * tag 'powerpc-5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (228 commits) Revert "powerpc/pci: unmap legacy INTx interrupts when a PHB is removed" selftests/powerpc: Fix eeh-basic.sh exit codes cpufreq: powernv: Fix frame-size-overflow in powernv_cpufreq_reboot_notifier powerpc/time: Make get_tb() common to PPC32 and PPC64 powerpc/time: Make get_tbl() common to PPC32 and PPC64 powerpc/time: Remove get_tbu() powerpc/time: Avoid using get_tbl() and get_tbu() internally powerpc/time: Make mftb() common to PPC32 and PPC64 powerpc/time: Rename mftbl() to mftb() powerpc/32s: Remove #ifdef CONFIG_PPC_BOOK3S_32 in head_book3s_32.S powerpc/32s: Rename head_32.S to head_book3s_32.S powerpc/32s: Setup the early hash table at all time. powerpc/time: Remove ifdef in get_dec() and set_dec() powerpc: Remove get_tb_or_rtc() powerpc: Remove __USE_RTC() powerpc: Tidy up a bit after removal of PowerPC 601. powerpc: Remove support for PowerPC 601 powerpc: Remove PowerPC 601 powerpc: Drop SYNC_601() ISYNC_601() and SYNC() powerpc: Remove CONFIG_PPC601_SYNC_FIX ...
2020-09-28Merge back cpuidle material for 5.10.Rafael J. Wysocki2-12/+2
2020-09-23cpuidle: record state entry rejection statisticsLina Iyer2-0/+4
CPUs may fail to enter the chosen idle state if there was a pending interrupt, causing the cpuidle driver to return an error value. Record that and export it via sysfs along with the other idle state statistics. This could prove useful in understanding behavior of the governor and the system during usecases that involve multiple CPUs. Signed-off-by: Lina Iyer <ilina@codeaurora.org> [ rjw: Changelog and documentation edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-09-22cpuidle: Drop misleading comments about RCU usageUlf Hansson1-10/+0
The commit 1098582a0f6c ("sched,idle,rcu: Push rcu_idle deeper into the idle path"), moved the calls rcu_idle_enter|exit() into the cpuidle core. However, it forgot to remove a couple of comments in enter_s2idle_proper() about why RCU_NONIDLE earlier was needed. So, let's drop them as they have become a bit misleading. Fixes: 1098582a0f6c ("sched,idle,rcu: Push rcu_idle deeper into the idle path") Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-09-22cpuidle: psci: Allow PM domain to be initialized even if no OSI modeUlf Hansson1-28/+31
If the PSCI OSI mode isn't supported or fails to be enabled, the PM domain topology with the genpd providers isn't initialized. This is perfectly fine from cpuidle-psci point of view. However, since the PM domain topology in the DTS files is a description of the HW, no matter of whether the PSCI OSI mode is supported or not, other consumers besides the CPUs may rely on it. Therefore, let's always allow the initialization of the PM domain topology to succeed, independently of whether the PSCI OSI mode is supported. Consequentially we need to track if we succeed to enable the OSI mode, as to know when a domain idlestate can be selected. Note that, CPU devices are still not being attached to the PM domain topology, unless the PSCI OSI mode is supported. Acked-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-09-22firmware: psci: Extend psci_set_osi_mode() to allow reset to PC modeUlf Hansson1-1/+1
The current user (cpuidle-psci) of psci_set_osi_mode() only needs to enable the PSCI OSI mode. Although, as subsequent changes shows, there is a need to be able to reset back into the PSCI PC mode. Therefore, let's extend psci_set_osi_mode() to take a bool as in-parameter, to let the user indicate whether to enable OSI or to switch back to PC mode. Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-09-21cpuidle: tegra: Correctly handle result of arm_cpuidle_simple_enter()Dmitry Osipenko1-14/+20
The enter() callback of CPUIDLE drivers returns index of the entered idle state on success or a negative value on failure. The negative value could any negative value, i.e. it doesn't necessarily needs to be a error code. That's because CPUIDLE core only cares about the fact of failure and not about the reason of the enter() failure. Like every other enter() callback, the arm_cpuidle_simple_enter() returns the entered idle-index on success. Unlike some of other drivers, it never fails. It happened that TEGRA_C1=index=err=0 in the code of cpuidle-tegra driver, and thus, there is no problem for the cpuidle-tegra driver created by the typo in the code which assumes that the arm_cpuidle_simple_enter() returns a error code. The arm_cpuidle_simple_enter() also may return a -ENODEV error if CPU_IDLE is disabled in a kernel's config, but all CPUIDLE drivers are disabled if CPU_IDLE is disabled, including the cpuidle-tegra driver. So we can't ever see the error code from arm_cpuidle_simple_enter() today. Of course the code may get some changes in the future and then the typo may transform into a real bug, so let's correct the typo! The tegra_cpuidle_state_enter() is now changed to make it return the entered idle-index on success and negative error code on fail, which puts it on par with the arm_cpuidle_simple_enter(), making code consistent in regards to the error handling. This patch fixes a minor typo in the code, it doesn't fix any bugs. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-09-21cpuidle: psci: Fix suspicious RCU usageUlf Hansson1-2/+2
The commit eb1f00237aca ("lockdep,trace: Expose tracepoints"), started to expose us for tracepoints. This lead to the following RCU splat on an ARM64 Qcom board. [ 5.529634] WARNING: suspicious RCU usage [ 5.537307] sdhci-pltfm: SDHCI platform and OF driver helper [ 5.541092] 5.9.0-rc3 #86 Not tainted [ 5.541098] ----------------------------- [ 5.541105] ../include/trace/events/lock.h:37 suspicious rcu_dereference_check() usage! [ 5.541110] [ 5.541110] other info that might help us debug this: [ 5.541110] [ 5.541116] [ 5.541116] rcu_scheduler_active = 2, debug_locks = 1 [ 5.541122] RCU used illegally from extended quiescent state! [ 5.541129] no locks held by swapper/0/0. [ 5.541134] [ 5.541134] stack backtrace: [ 5.541143] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-rc3 #86 [ 5.541149] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT) [ 5.541157] Call trace: [ 5.568185] sdhci_msm 7864900.sdhci: Got CD GPIO [ 5.574186] dump_backtrace+0x0/0x1c8 [ 5.574206] show_stack+0x14/0x20 [ 5.574229] dump_stack+0xe8/0x154 [ 5.574250] lockdep_rcu_suspicious+0xd4/0xf8 [ 5.574269] lock_acquire+0x3f0/0x460 [ 5.574292] _raw_spin_lock_irqsave+0x80/0xb0 [ 5.574314] __pm_runtime_suspend+0x4c/0x188 [ 5.574341] psci_enter_domain_idle_state+0x40/0xa0 [ 5.574362] cpuidle_enter_state+0xc0/0x610 [ 5.646487] cpuidle_enter+0x38/0x50 [ 5.650651] call_cpuidle+0x18/0x40 [ 5.654467] do_idle+0x228/0x278 [ 5.657678] cpu_startup_entry+0x24/0x70 [ 5.661153] rest_init+0x1a4/0x278 [ 5.665061] arch_call_rest_init+0xc/0x14 [ 5.668272] start_kernel+0x508/0x540 Following the path in pm_runtime_put_sync_suspend() from psci_enter_domain_idle_state(), it seems like we end up using the RCU. Therefore, let's simply silence the splat by informing the RCU about it with RCU_NONIDLE. Note that, this is a temporary solution. Instead we should strive to avoid using RCU_NONIDLE (and similar), but rather push rcu_idle_enter|exit() further down, closer to the arch specific code. However, as the CPU PM notifiers are also using the RCU, additional rework is needed. Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-09-18Merge tag 'powerpc-5.9-5' of ↵Linus Torvalds1-4/+11
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc fixes from Michael Ellerman: "Some more powerpc fixes for 5.9: - Opt us out of the DEBUG_VM_PGTABLE support for now as it's causing crashes. - Fix a long standing bug in our DMA mask handling that was hidden until recently, and which caused problems with some drivers. - Fix a boot failure on systems with large amounts of RAM, and no hugepage support and using Radix MMU, only seen in the lab. - A few other minor fixes. Thanks to Alexey Kardashevskiy, Aneesh Kumar K.V, Gautham R. Shenoy, Hari Bathini, Ira Weiny, Nick Desaulniers, Shirisha Ganta, Vaibhav Jain, and Vaidyanathan Srinivasan" * tag 'powerpc-5.9-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/papr_scm: Limit the readability of 'perf_stats' sysfs attribute cpuidle: pseries: Fix CEDE latency conversion from tb to us powerpc/dma: Fix dma_map_ops::get_required_mask Revert "powerpc/build: vdso linker warning for orphan sections" powerpc/mm: Remove DEBUG_VM_PGTABLE support on powerpc selftests/powerpc: Skip PROT_SAO test in guests/LPARS powerpc/book3s64/radix: Fix boot failure with large amount of guest memory
2020-09-16cpuidle: Allow cpuidle drivers to take over RCU-idlePeter Zijlstra1-5/+10
Some drivers have to do significant work, some of which relies on RCU still being active. Instead of using RCU_NONIDLE in the drivers and flipping RCU back on, allow drivers to take over RCU-idle duty. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Borislav Petkov <bp@suse.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-09-15powerpc/powernv/idle: add a basic stop 0-3 driver for POWER10Nicholas Piggin1-1/+1
This driver does not restore stop > 3 state, so it limits itself to states which do not lose full state or TB. The POWER10 SPRs are sufficiently different from P9 that it seems easier to split out the P10 code. The POWER10 deep sleep code (e.g., the BHRB restore) has been taken out, but it can be re-added when stop > 3 support is added. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Tested-by: Pratik Rajesh Sampat<psampat@linux.ibm.com> Tested-by: Vaidyanathan Srinivasan <svaidy@linux.ibm.com> Reviewed-by: Pratik Rajesh Sampat<psampat@linux.ibm.com> Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200819094700.493399-1-npiggin@gmail.com
2020-09-08cpuidle: pseries: Fix CEDE latency conversion from tb to usGautham R. Shenoy1-4/+11
Commit d947fb4c965c ("cpuidle: pseries: Fixup exit latency for CEDE(0)") sets the exit latency of CEDE(0) based on the latency values of the Extended CEDE states advertised by the platform. The values advertised by the platform are in timebase ticks. However the cpuidle framework requires the latency values in microseconds. If the tb-ticks value advertised by the platform correspond to a value smaller than 1us, during the conversion from tb-ticks to microseconds, in the current code, the result becomes zero. This is incorrect as it puts a CEDE state on par with the snooze state. This patch fixes this by rounding up the result obtained while converting the latency value from tb-ticks to microseconds. It also prints a warning in case we discover an extended-cede state with wakeup latency to be 0. In such a case, ensure that CEDE(0) has a non-zero wakeup latency. Fixes: d947fb4c965c ("cpuidle: pseries: Fixup exit latency for CEDE(0)") Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1599125247-28488-1-git-send-email-ego@linux.vnet.ibm.com
2020-08-26cpuidle: Make CPUIDLE_FLAG_TLB_FLUSHED genericPeter Zijlstra1-0/+4
This allows moving the leave_mm() call into generic code before rcu_idle_enter(). Gets rid of more trace_*_rcuidle() users. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Marco Elver <elver@google.com> Link: https://lkml.kernel.org/r/20200821085348.369441600@infradead.org
2020-08-26sched,idle,rcu: Push rcu_idle deeper into the idle pathPeter Zijlstra1-4/+8
Lots of things take locks, due to a wee bug, rcu_lockdep didn't notice that the locking tracepoints were using RCU. Push rcu_idle_{enter,exit}() as deep as possible into the idle paths, this also resolves a lot of _rcuidle()/RCU_NONIDLE() usage. Specifically, sched_clock_idle_wakeup_event() will use ktime which will use seqlocks which will tickle lockdep, and stop_critical_timings() uses lock. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Marco Elver <elver@google.com> Link: https://lkml.kernel.org/r/20200821085348.310943801@infradead.org
2020-08-26cpuidle: Fixup IRQ statePeter Zijlstra1-1/+2
Match the pattern elsewhere in this file. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Marco Elver <elver@google.com> Link: https://lkml.kernel.org/r/20200821085348.251340558@infradead.org