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2020-11-16cpuidle: tegra: Annotate tegra_pm_set_cpu_in_lp2() with RCU_NONIDLEDmitry Osipenko
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>
2020-10-16Merge tag 'powerpc-5.10-1' of ↵Linus Torvalds
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. Wysocki
2020-09-23cpuidle: record state entry rejection statisticsLina Iyer
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 Hansson
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 Hansson
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 Hansson
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 Osipenko
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 Hansson
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 Torvalds
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 Zijlstra
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 Piggin
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. Shenoy
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 Zijlstra
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 Zijlstra
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 Zijlstra
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
2020-08-07Merge tag 'powerpc-5.9-1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: - Add support for (optionally) using queued spinlocks & rwlocks. - Support for a new faster system call ABI using the scv instruction on Power9 or later. - Drop support for the PROT_SAO mmap/mprotect flag as it will be unsupported on Power10 and future processors, leaving us with no way to implement the functionality it requests. This risks breaking userspace, though we believe it is unused in practice. - A bug fix for, and then the removal of, our custom stack expansion checking. We now allow stack expansion up to the rlimit, like other architectures. - Remove the remnants of our (previously disabled) topology update code, which tried to react to NUMA layout changes on virtualised systems, but was prone to crashes and other problems. - Add PMU support for Power10 CPUs. - A change to our signal trampoline so that we don't unbalance the link stack (branch return predictor) in the signal delivery path. - Lots of other cleanups, refactorings, smaller features and so on as usual. Thanks to: Abhishek Goel, Alastair D'Silva, Alexander A. Klimov, Alexey Kardashevskiy, Alistair Popple, Andrew Donnellan, Aneesh Kumar K.V, Anju T Sudhakar, Anton Blanchard, Arnd Bergmann, Athira Rajeev, Balamuruhan S, Bharata B Rao, Bill Wendling, Bin Meng, Cédric Le Goater, Chris Packham, Christophe Leroy, Christoph Hellwig, Daniel Axtens, Dan Williams, David Lamparter, Desnes A. Nunes do Rosario, Erhard F., Finn Thain, Frederic Barrat, Ganesh Goudar, Gautham R. Shenoy, Geoff Levand, Greg Kurz, Gustavo A. R. Silva, Hari Bathini, Harish, Imre Kaloz, Joel Stanley, Joe Perches, John Crispin, Jordan Niethe, Kajol Jain, Kamalesh Babulal, Kees Cook, Laurent Dufour, Leonardo Bras, Li RongQing, Madhavan Srinivasan, Mahesh Salgaonkar, Mark Cave-Ayland, Michal Suchanek, Milton Miller, Mimi Zohar, Murilo Opsfelder Araujo, Nathan Chancellor, Nathan Lynch, Naveen N. Rao, Nayna Jain, Nicholas Piggin, Oliver O'Halloran, Palmer Dabbelt, Pedro Miraglia Franco de Carvalho, Philippe Bergheaud, Pingfan Liu, Pratik Rajesh Sampat, Qian Cai, Qinglang Miao, Randy Dunlap, Ravi Bangoria, Sachin Sant, Sam Bobroff, Sandipan Das, Santosh Sivaraj, Satheesh Rajendran, Shirisha Ganta, Sourabh Jain, Srikar Dronamraju, Stan Johnson, Stephen Rothwell, Thadeu Lima de Souza Cascardo, Thiago Jung Bauermann, Tom Lane, Vaibhav Jain, Vladis Dronov, Wei Yongjun, Wen Xiong, YueHaibing. * tag 'powerpc-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (337 commits) selftests/powerpc: Fix pkey syscall redefinitions powerpc: Fix circular dependency between percpu.h and mmu.h powerpc/powernv/sriov: Fix use of uninitialised variable selftests/powerpc: Skip vmx/vsx/tar/etc tests on older CPUs powerpc/40x: Fix assembler warning about r0 powerpc/papr_scm: Add support for fetching nvdimm 'fuel-gauge' metric powerpc/papr_scm: Fetch nvdimm performance stats from PHYP cpuidle: pseries: Fixup exit latency for CEDE(0) cpuidle: pseries: Add function to parse extended CEDE records cpuidle: pseries: Set the latency-hint before entering CEDE selftests/powerpc: Fix online CPU selection powerpc/perf: Consolidate perf_callchain_user_[64|32]() powerpc/pseries/hotplug-cpu: Remove double free in error path powerpc/pseries/mobility: Add pr_debug() for device tree changes powerpc/pseries/mobility: Set pr_fmt() powerpc/cacheinfo: Warn if cache object chain becomes unordered powerpc/cacheinfo: Improve diagnostics about malformed cache lists powerpc/cacheinfo: Use name@unit instead of full DT path in debug messages powerpc/cacheinfo: Set pr_fmt() powerpc: fix function annotations to avoid section mismatch warnings with gcc-10 ...
2020-07-30cpuidle: pseries: Fixup exit latency for CEDE(0)Gautham R. Shenoy
We are currently assuming that CEDE(0) has exit latency 10us, since there is no way for us to query from the platform. However, if the wakeup latency of an Extended CEDE state is smaller than 10us, then we can be sure that the exit latency of CEDE(0) cannot be more than that. In this patch, we fix the exit latency of CEDE(0) if we discover an Extended CEDE state with wakeup latency smaller than 10us. Benchmark results: On POWER8, this patch does not have any impact since the advertized latency of Extended CEDE (1) is 30us which is higher than the default latency of CEDE (0) which is 10us. On POWER9 we see improvement the single-threaded performance of ebizzy, and no regression in the wakeup latency or the number of context-switches. ebizzy: 2 ebizzy threads bound to the same big-core. 25% improvement in the avg records/s with patch. x without_patch * with_patch N Min Max Median Avg Stddev x 10 2491089 5834307 5398375 4244335 1596244.9 * 10 2893813 5834474 5832448 5327281.3 1055941.4 context_switch2: There is no major regression observed with this patch as seen from the context_switch2 benchmark. context_switch2 across CPU0 CPU1 (Both belong to same big-core, but different small cores). We observe a minor 0.14% regression in the number of context-switches (higher is better). x without_patch * with_patch N Min Max Median Avg Stddev x 500 348872 362236 354712 354745.69 2711.827 * 500 349422 361452 353942 354215.4 2576.9258 Difference at 99.0% confidence -530.288 +/- 430.963 -0.149484% +/- 0.121485% (Student's t, pooled s = 2645.24) context_switch2 across CPU0 CPU8 (Different big-cores). We observe a 0.37% improvement in the number of context-switches (higher is better). x without_patch * with_patch N Min Max Median Avg Stddev x 500 287956 294940 288896 288977.23 646.59295 * 500 288300 294646 289582 290064.76 1161.9992 Difference at 99.0% confidence 1087.53 +/- 153.194 0.376337% +/- 0.0530125% (Student's t, pooled s = 940.299) schbench: No major difference could be seen until the 99.9th percentile. Without-patch: Latency percentiles (usec) 50.0th: 29 75.0th: 39 90.0th: 49 95.0th: 59 *99.0th: 13104 99.5th: 14672 99.9th: 15824 min=0, max=17993 With-patch: Latency percentiles (usec) 50.0th: 29 75.0th: 40 90.0th: 50 95.0th: 61 *99.0th: 13648 99.5th: 14768 99.9th: 15664 min=0, max=29812 Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> [mpe: Minor formatting] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1596087177-30329-4-git-send-email-ego@linux.vnet.ibm.com
2020-07-30cpuidle: pseries: Add function to parse extended CEDE recordsGautham R. Shenoy
Currently we use CEDE with latency-hint 0 as the only other idle state on a dedicated LPAR apart from the polling "snooze" state. The platform might support additional extended CEDE idle states, which can be discovered through the "ibm,get-system-parameter" rtas-call made with CEDE_LATENCY_TOKEN. This patch adds a function to obtain information about the extended CEDE idle states from the platform and parse the contents to populate an array of extended CEDE states. These idle states thus discovered will be added to the cpuidle framework in the next patch. dmesg on a POWER8 and POWER9 LPAR, demonstrating the output of parsing the extended CEDE latency parameters are as follows POWER8 [ 10.093279] xcede : xcede_record_size = 10 [ 10.093285] xcede : Record 0 : hint = 1, latency = 0x3c00 tb ticks, Wake-on-irq = 1 [ 10.093291] xcede : Record 1 : hint = 2, latency = 0x4e2000 tb ticks, Wake-on-irq = 0 [ 10.093297] cpuidle : Skipping the 2 Extended CEDE idle states POWER9 [ 5.913180] xcede : xcede_record_size = 10 [ 5.913183] xcede : Record 0 : hint = 1, latency = 0x400 tb ticks, Wake-on-irq = 1 [ 5.913188] xcede : Record 1 : hint = 2, latency = 0x3e8000 tb ticks, Wake-on-irq = 0 [ 5.913193] cpuidle : Skipping the 2 Extended CEDE idle states Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> [mpe: Make space for 16 records, drop memset, minor cleanup & formatting] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1596087177-30329-3-git-send-email-ego@linux.vnet.ibm.com
2020-07-30cpuidle: pseries: Set the latency-hint before entering CEDEGautham R. Shenoy
As per the PAPR, each H_CEDE call is associated with a latency-hint to be passed in the VPA field "cede_latency_hint". The CEDE states that we were implicitly entering so far is CEDE with latency-hint = 0. This patch explicitly sets the latency hint corresponding to the CEDE state that we are currently entering. While at it, we save the previous hint, to be restored once we wakeup from CEDE. This will be required in the future when we expose extended-cede states through the cpuidle framework, where each of them will have a different cede-latency hint. Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> [mpe: Make cede_latency_hint static] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1596087177-30329-2-git-send-email-ego@linux.vnet.ibm.com
2020-07-29cpuidle: change enter_s2idle() prototypeNeal Liu
Control Flow Integrity(CFI) is a security mechanism that disallows changes to the original control flow graph of a compiled binary, making it significantly harder to perform such attacks. init_state_node() assign same function callback to different function pointer declarations. static int init_state_node(struct cpuidle_state *idle_state, const struct of_device_id *matches, struct device_node *state_node) { ... idle_state->enter = match_id->data; ... idle_state->enter_s2idle = match_id->data; } Function declarations: struct cpuidle_state { ... int (*enter) (struct cpuidle_device *dev, struct cpuidle_driver *drv, int index); void (*enter_s2idle) (struct cpuidle_device *dev, struct cpuidle_driver *drv, int index); }; In this case, either enter() or enter_s2idle() would cause CFI check failed since they use same callee. Align function prototype of enter() since it needs return value for some use cases. The return value of enter_s2idle() is no need currently. Signed-off-by: Neal Liu <neal.liu@mediatek.com> Reviewed-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-07-29cpuidle: psci: Prevent domain idlestates until consumers are readyUlf Hansson
Depending on the SoC/platform, additional devices may be part of the PSCI PM domain topology. This is the case with 'qcom,rpmh-rsc' device, for example, even if this is not yet visible in the corresponding DTS-files. Without going into too much details, a device like the 'qcom,rpmh-rsc' may have HW constraints that needs to be obeyed to, before a domain idlestate can be picked. Therefore, let's implement the ->sync_state() callback to receive a notification when all consumers of the PSCI PM domain providers have been attached/probed to it. In this way, we can make sure all constraints from all relevant devices, are taken into account before allowing a domain idlestate to be picked. Acked-by: Saravana Kannan <saravanak@google.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-07-29cpuidle: psci: Convert PM domain to platform driverUlf Hansson
To enable support for deferred probing and to allow implementation of the ->sync_state() callback from subsequent changes, let's convert into a platform driver. Reviewed-by: Lina Iyer <ilina@codeaurora.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-07-29cpuidle: psci: Fix error path via converting to a platform driverUlf Hansson
The current error paths for the cpuidle-psci driver, may leak memory or possibly leave CPU devices attached to their PM domains. These are quite harmless issues, but still deserves to be taken care of. Although, rather than fixing them by keeping track of allocations that needs to be freed, which tends to become a bit messy, let's convert into a platform driver. In this way, it gets easier to fix the memory leaks as we can rely on the devm_* functions. Moreover, converting to a platform driver also enables support for deferred probe, which subsequent changes takes benefit from. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-07-29cpuidle: psci: Fail cpuidle registration if set OSI mode failedUlf Hansson
Currently we allow the cpuidle driver registration to succeed, even if we failed to enable the OSI mode when the hierarchical DT layout is used. This means running in a degraded mode, by using the available idle states per CPU, while also preventing the domain idle states. Moving forward, this behaviour looks quite questionable to maintain, as complexity seems to grow around it, especially when trying to add support for deferred probe, for example. Therefore, let's make the cpuidle driver registration to fail in this situation, thus relying on the default architectural cpuidle backend for WFI to be used. Reviewed-by: Lina Iyer <ilina@codeaurora.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-07-29cpuidle: psci: Split into two separate build objectsUlf Hansson
The combined build object for the PSCI cpuidle driver and the PSCI PM domain, is a bit messy. Therefore let's split it up by adding a new Kconfig ARM_PSCI_CPUIDLE_DOMAIN and convert into two separate objects. Reviewed-by: Lina Iyer <ilina@codeaurora.org> 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>
2020-07-16cpuidle/pseries: Make symbol 'pseries_idle_driver' staticWei Yongjun
The sparse tool complains as follows: drivers/cpuidle/cpuidle-pseries.c:25:23: warning: symbol 'pseries_idle_driver' was not declared. Should it be static? 'pseries_idle_driver' is not used outside of this file, so marks it static. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200714142424.66648-1-weiyongjun1@huawei.com
2020-07-15cpuidle/powernv : Remove dead code blockAbhishek Goel
Commit 1961acad2f88559c2cdd2ef67c58c3627f1f6e54 removes usage of function "validate_dt_prop_sizes". This patch removes this unused function. Signed-off-by: Abhishek Goel <huntbag@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200706053258.121475-1-huntbag@linux.vnet.ibm.com
2020-06-25cpuidle: Rearrange s2idle-specific idle state entry codeRafael J. Wysocki
Implement call_cpuidle_s2idle() in analogy with call_cpuidle() for the s2idle-specific idle state entry and invoke it from cpuidle_idle_call() to make the s2idle-specific idle entry code path look more similar to the "regular" idle entry one. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Chen Yu <yu.c.chen@intel.com>
2020-06-23PM: s2idle: Clear _TIF_POLLING_NRFLAG before suspend to idleChen Yu
Suspend to idle was found to not work on Goldmont CPU recently. The issue happens due to: 1. On Goldmont the CPU in idle can only be woken up via IPIs, not POLLING mode, due to commit 08e237fa56a1 ("x86/cpu: Add workaround for MONITOR instruction erratum on Goldmont based CPUs") 2. When the CPU is entering suspend to idle process, the _TIF_POLLING_NRFLAG remains on, because cpuidle_enter_s2idle() doesn't match call_cpuidle() exactly. 3. Commit b2a02fc43a1f ("smp: Optimize send_call_function_single_ipi()") makes use of _TIF_POLLING_NRFLAG to avoid sending IPIs to idle CPUs. 4. As a result, some IPIs related functions might not work well during suspend to idle on Goldmont. For example, one suspected victim: tick_unfreeze() -> timekeeping_resume() -> hrtimers_resume() -> clock_was_set() -> on_each_cpu() might wait forever, because the IPIs will not be sent to the CPUs which are sleeping with _TIF_POLLING_NRFLAG set, and Goldmont CPU could not be woken up by only setting _TIF_NEED_RESCHED on the monitor address. To avoid that, clear the _TIF_POLLING_NRFLAG flag before invoking enter_s2idle_proper() in cpuidle_enter_s2idle() in analogy with the call_cpuidle() code flow. Fixes: b2a02fc43a1f ("smp: Optimize send_call_function_single_ipi()") Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Suggested-by: Rafael J. Wysocki <rafael@kernel.org> Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Chen Yu <yu.c.chen@intel.com> [ rjw: Subject / changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-06-12Merge tag 'thermal-v5.8-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux Pull thermal updates from Daniel Lezcano: - Add the hwmon support on the i.MX SC (Anson Huang) - Thermal framework cleanups (self-encapsulation, pointless stubs, private structures) (Daniel Lezcano) - Use the PM QoS frequency changes for the devfreq cooling device (Matthias Kaehlcke) - Remove duplicate error messages from platform_get_irq() error handling (Markus Elfring) - Add support for the bandgap sensors (Keerthy) - Statically initialize .get_mode/.set_mode ops (Andrzej Pietrasiewicz) - Add Renesas R-Car maintainer entry (Niklas Söderlund) - Fix error checking after calling ti_bandgap_get_sensor_data() for the TI SoC thermal (Sudip Mukherjee) - Add latency constraint for the idle injection, the DT binding and the change the registering function (Daniel Lezcano) - Convert the thermal framework binding to the Yaml schema (Amit Kucheria) - Replace zero-length array with flexible-array on i.MX 8MM (Gustavo A. R. Silva) - Thermal framework cleanups (alphabetic order for heads, replace module.h by export.h, make file naming consistent) (Amit Kucheria) - Merge tsens-common into the tsens driver (Amit Kucheria) - Fix platform dependency for the Qoriq driver (Geert Uytterhoeven) - Clean up the rcar_thermal_update_temp() function in the rcar thermal driver (Niklas Söderlund) - Fix the TMSAR register for the TMUv2 on the Qoriq platform (Yuantian Tang) - Export GDDV, OEM vendor variables, and don't require IDSP for the int340x thermal driver - trivial conflicts fixed (Matthew Garrett) * tag 'thermal-v5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux: (48 commits) thermal/int340x_thermal: Don't require IDSP to exist thermal/int340x_thermal: Export OEM vendor variables thermal/int340x_thermal: Export GDDV thermal: qoriq: Update the settings for TMUv2 thermal: rcar_thermal: Clean up rcar_thermal_update_temp() thermal: qoriq: Add platform dependencies drivers: thermal: tsens: Merge tsens-common.c into tsens.c thermal/of: Rename of-thermal.c thermal/governors: Prefix all source files with gov_ thermal/drivers/user_space: Sort headers alphabetically thermal/drivers/of-thermal: Sort headers alphabetically thermal/drivers/cpufreq_cooling: Replace module.h with export.h thermal/drivers/cpufreq_cooling: Sort headers alphabetically thermal/drivers/clock_cooling: Include export.h thermal/drivers/clock_cooling: Sort headers alphabetically thermal/drivers/thermal_hwmon: Include export.h thermal/drivers/thermal_hwmon: Sort headers alphabetically thermal/drivers/thermal_helpers: Include export.h thermal/drivers/thermal_helpers: Sort headers alphabetically thermal/core: Replace module.h with export.h ...
2020-06-05Merge tag 'powerpc-5.8-1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: - Support for userspace to send requests directly to the on-chip GZIP accelerator on Power9. - Rework of our lockless page table walking (__find_linux_pte()) to make it safe against parallel page table manipulations without relying on an IPI for serialisation. - A series of fixes & enhancements to make our machine check handling more robust. - Lots of plumbing to add support for "prefixed" (64-bit) instructions on Power10. - Support for using huge pages for the linear mapping on 8xx (32-bit). - Remove obsolete Xilinx PPC405/PPC440 support, and an associated sound driver. - Removal of some obsolete 40x platforms and associated cruft. - Initial support for booting on Power10. - Lots of other small features, cleanups & fixes. Thanks to: Alexey Kardashevskiy, Alistair Popple, Andrew Donnellan, Andrey Abramov, Aneesh Kumar K.V, Balamuruhan S, Bharata B Rao, Bulent Abali, Cédric Le Goater, Chen Zhou, Christian Zigotzky, Christophe JAILLET, Christophe Leroy, Dmitry Torokhov, Emmanuel Nicolet, Erhard F., Gautham R. Shenoy, Geoff Levand, George Spelvin, Greg Kurz, Gustavo A. R. Silva, Gustavo Walbon, Haren Myneni, Hari Bathini, Joel Stanley, Jordan Niethe, Kajol Jain, Kees Cook, Leonardo Bras, Madhavan Srinivasan., Mahesh Salgaonkar, Markus Elfring, Michael Neuling, Michal Simek, Nathan Chancellor, Nathan Lynch, Naveen N. Rao, Nicholas Piggin, Oliver O'Halloran, Paul Mackerras, Pingfan Liu, Qian Cai, Ram Pai, Raphael Moreira Zinsly, Ravi Bangoria, Sam Bobroff, Sandipan Das, Segher Boessenkool, Stephen Rothwell, Sukadev Bhattiprolu, Tyrel Datwyler, Wolfram Sang, Xiongfeng Wang. * tag 'powerpc-5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (299 commits) powerpc/pseries: Make vio and ibmebus initcalls pseries specific cxl: Remove dead Kconfig options powerpc: Add POWER10 architected mode powerpc/dt_cpu_ftrs: Add MMA feature powerpc/dt_cpu_ftrs: Enable Prefixed Instructions powerpc/dt_cpu_ftrs: Advertise support for ISA v3.1 if selected powerpc: Add support for ISA v3.1 powerpc: Add new HWCAP bits powerpc/64s: Don't set FSCR bits in INIT_THREAD powerpc/64s: Save FSCR to init_task.thread.fscr after feature init powerpc/64s: Don't let DT CPU features set FSCR_DSCR powerpc/64s: Don't init FSCR_DSCR in __init_FSCR() powerpc/32s: Fix another build failure with CONFIG_PPC_KUAP_DEBUG powerpc/module_64: Use special stub for _mcount() with -mprofile-kernel powerpc/module_64: Simplify check for -mprofile-kernel ftrace relocations powerpc/module_64: Consolidate ftrace code powerpc/32: Disable KASAN with pages bigger than 16k powerpc/uaccess: Don't set KUEP by default on book3s/32 powerpc/uaccess: Don't set KUAP by default on book3s/32 powerpc/8xx: Reduce time spent in allow_user_access() and friends ...
2020-06-04Merge tag 'arm-drivers-5.8' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc Pull ARM/SoC driver updates from Arnd Bergmann: "These are updates to SoC specific drivers that did not have another subsystem maintainer tree to go through for some reason: - Some bus and memory drivers for the MIPS P5600 based Baikal-T1 SoC that is getting added through the MIPS tree. - There are new soc_device identification drivers for TI K3, Qualcomm MSM8939 - New reset controller drivers for NXP i.MX8MP, Renesas RZ/G1H, and Hisilicon hi6220 - The SCMI firmware interface can now work across ARM SMC/HVC as a transport. - Mediatek platforms now use a new driver for their "MMSYS" hardware block that controls clocks and some other aspects in behalf of the media and gpu drivers. - Some Tegra processors have improved power management support, including getting woken up by the PMIC and cluster power down during idle. - A new v4l staging driver for Tegra is added. - Cleanups and minor bugfixes for TI, NXP, Hisilicon, Mediatek, and Tegra" * tag 'arm-drivers-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (155 commits) clk: sprd: fix compile-testing bus: bt1-axi: Build the driver into the kernel bus: bt1-apb: Build the driver into the kernel bus: bt1-axi: Use sysfs_streq instead of strncmp bus: bt1-axi: Optimize the return points in the driver bus: bt1-apb: Use sysfs_streq instead of strncmp bus: bt1-apb: Use PTR_ERR_OR_ZERO to return from request-regs method bus: bt1-apb: Fix show/store callback identations bus: bt1-apb: Include linux/io.h dt-bindings: memory: Add Baikal-T1 L2-cache Control Block binding memory: Add Baikal-T1 L2-cache Control Block driver bus: Add Baikal-T1 APB-bus driver bus: Add Baikal-T1 AXI-bus driver dt-bindings: bus: Add Baikal-T1 APB-bus binding dt-bindings: bus: Add Baikal-T1 AXI-bus binding staging: tegra-video: fix V4L2 dependency tee: fix crypto select drivers: soc: ti: knav_qmss_queue: Make knav_gp_range_ops static soc: ti: add k3 platforms chipid module driver dt-bindings: soc: ti: add binding for k3 platforms chipid module ...
2020-05-29cpuidle: Fix three reference count leaksQiushi Wu
kobject_init_and_add() takes reference even when it fails. If this function returns an error, kobject_put() must be called to properly clean up the memory associated with the object. Previous commit "b8eb718348b8" fixed a similar problem. Signed-off-by: Qiushi Wu <wu000273@umn.edu> [ rjw: Subject ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-05-26cpuidle: Convert Qualcomm SPM driver to a generic CPUidle driverStephan Gerhold
The Qualcomm SPM cpuidle driver seems to be the last driver still using the generic ARM CPUidle infrastructure. Converting it actually allows us to simplify the driver, and we end up being able to remove more lines than adding new ones: - We can parse the CPUidle states in the device tree directly with dt_idle_states (and don't need to duplicate that functionality into the spm driver). - Each "saw" device managed by the SPM driver now directly registers its own cpuidle driver, removing the need for any global (per cpu) state. The device tree binding is the same, so the driver stays compatible with all old device trees. Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Reviewed-by: Lina Iyer <ilina@codeaurora.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-05-19cpuidle: sysfs: Remove sysfs_switch and switch attributesHanjun Guo
Since the cpuidle governor can be switched via sysfs in default, remove sysfs_switch and cpuidle_switch_attrs. Signed-off-by: Hanjun Guo <guohanjun@huawei.com> Reviewed-by: Doug Smythies <dsmythies@telus.net> Tested-by: Doug Smythies <dsmythies@telus.net> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-05-19cpuidle: Make cpuidle governor switchable to be the default behaviourHanjun Guo
For now cpuidle governor can be switched via sysfs only when the boot option "cpuidle_sysfs_switch" is passed, but it's important to switch the governor to adapt to different workloads, especially after TEO and haltpoll governor were introduced. Add available_governors and current_governor into the default attributes, but reserve the current_governor_ro for compatiblity. Signed-off-by: Hanjun Guo <guohanjun@huawei.com> Reviewed-by: Doug Smythies <dsmythies@telus.net> Tested-by: Doug Smythies <dsmythies@telus.net> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-05-19cpuidle: sysfs: Accept governor name with 15 charactersHanjun Guo
CPUIDLE_NAME_LEN is 16, so it's possible to accept governor name with 15 characters, but now store_current_governor() rejects governor name with 15 characters as it returns -EINVAL if count equals CPUIDLE_NAME_LEN. Refactor the code to accept such case and simplify the code. Signed-off-by: Hanjun Guo <guohanjun@huawei.com> Reviewed-by: Doug Smythies <dsmythies@telus.net> Tested-by: Doug Smythies <dsmythies@telus.net> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-05-19cpuidle: sysfs: Fix the overlap for showing available governorsHanjun Guo
When showing the available governors, it's "%s " in scnprintf(), not "%s", so if the governor name has 15 characters, it will overlap with the later one, fix it by adding one more for the size. While we are at it, fix the minor coding style issue and remove the "/sizeof(char)" since sizeof(char) always equals 1. Signed-off-by: Hanjun Guo <guohanjun@huawei.com> Reviewed-by: Doug Smythies <dsmythies@telus.net> Tested-by: Doug Smythies <dsmythies@telus.net> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-05-19thermal: cpuidle: Register cpuidle cooling deviceDaniel Lezcano
The cpuidle driver can be used as a cooling device by injecting idle cycles. When the property is set, register the cpuidle driver with the idle state node pointer as a cooling device. The thermal framework will do the association automatically with the thermal zone via the cooling-device defined in the device tree cooling-maps section. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org> Acked-by: Sudeep Holla <sudeep.holla@arm.com> Link: https://lore.kernel.org/r/20200429103644.5492-4-daniel.lezcano@linaro.org
2020-05-15cpuidle: psci: Fixup execution order when entering a domain idle stateUlf Hansson
Moving forward, platforms are going to need to execute specific "last-man" operations before a domain idle state can be entered. In one way or the other, these operations needs to be triggered while walking the hierarchical topology via runtime PM and genpd, as it's at that point the last-man becomes known. Moreover, executing last-man operations needs to be done after the CPU PM notifications are sent through cpu_pm_enter(), as otherwise it's likely that some notifications would fail. Therefore, let's re-order the sequence in psci_enter_domain_idle_state(), so cpu_pm_enter() gets called prior pm_runtime_put_sync(). Fixes: ce85aef570df ("cpuidle: psci: Manage runtime PM in the idle path") Reported-by: Lina Iyer <ilina@codeaurora.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-05-06cpuidle: tegra: Support CPU cluster power-down state on Tegra30Dmitry Osipenko
The new Tegra CPU Idle driver now has a unified code path for the coupled CC6 (LP2) state, this allows to enable the deepest idling state on Tegra30 SoC where the whole CPU cluster is power-gated. Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Tested-by: Jasper Korten <jja2000@gmail.com> Tested-by: David Heidelberg <david@ixit.cz> Tested-by: Peter Geis <pgwipeout@gmail.com> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
2020-04-30powerpc/idle: Store PURR snapshot in a per-cpu global variableGautham R. Shenoy
Currently when CPU goes idle, we take a snapshot of PURR via pseries_idle_prolog() which is used at the CPU idle exit to compute the idle PURR cycles via the function pseries_idle_epilog(). Thus, the value of idle PURR cycle thus read before pseries_idle_prolog() and after pseries_idle_epilog() is always correct. However, if we were to read the idle PURR cycles from an interrupt context between pseries_idle_prolog() and pseries_idle_epilog() (this will be done in a future patch), then, the value of the idle PURR thus read will not include the cycles spent in the most recent idle period. Thus, in that interrupt context, we will need access to the snapshot of the PURR before going idle, in order to compute the idle PURR cycles for the latest idle duration. In this patch, we save the snapshot of PURR in pseries_idle_prolog() in a per-cpu variable, instead of on the stack, so that it can be accessed from an interrupt context. 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/1586249263-14048-3-git-send-email-ego@linux.vnet.ibm.com
2020-04-30powerpc: Move idle_loop_prolog()/epilog() functions to header fileGautham R. Shenoy
Currently prior to entering an idle state on a Linux Guest, the pseries cpuidle driver implement an idle_loop_prolog() and idle_loop_epilog() functions which ensure that idle_purr is correctly computed, and the hypervisor is informed that the CPU cycles have been donated. These prolog and epilog functions are also required in the default idle call, i.e pseries_lpar_idle(). Hence move these accessor functions to a common header file and call them from pseries_lpar_idle(). Since the existing header files such as asm/processor.h have enough clutter, create a new header file asm/idle.h. Finally rename idle_loop_prolog() and idle_loop_epilog() to pseries_idle_prolog() and pseries_idle_epilog() as they are only relavent for on pseries guests. 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/1586249263-14048-2-git-send-email-ego@linux.vnet.ibm.com
2020-04-29cpuidle: sysfs: Minor coding style correctionsHanjun Guo
Fix two minor coding style issues. Signed-off-by: Hanjun Guo <guohanjun@huawei.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-04-29cpuidle: sysfs: Remove the unused define_one_r(o/w) macrosHanjun Guo
The define_one_ro and define_one_rw macros are not used, remove it. Signed-off-by: Hanjun Guo <guohanjun@huawei.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-04-10Merge branch 'pm-cpuidle'Rafael J. Wysocki
* pm-cpuidle: cpuidle-haltpoll: Fix small typo
2020-04-08cpuidle-haltpoll: Fix small typoYihao Wu
Fix a spelling typo in cpuidle-haltpoll.c. Signed-off-by: Yihao Wu <wuyihao@linux.alibaba.com> [ rjw: Subject & changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-04-03Merge tag 'arm-soc-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/socLinus Torvalds
Pull ARM SoC updates from Arnd Bergmann: "The code changes are mostly for 32-bit platforms and include: - Lots of updates for the Nvidia Tegra platform, including cpuidle, pmc, and dt-binding changes - Microchip at91 power management updates for the recently added sam9x60 SoC - Treewide setup_irq deprecation by afzal mohammed - STMicroelectronics stm32 gains earlycon support - Renesas platforms with Cortex-A9 can now use the global timer - Some TI OMAP2+ platforms gain cpuidle support - Various cleanups for the i.MX6 and Orion platforms, as well as Kconfig files across all platforms" * tag 'arm-soc-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (75 commits) ARM: qcom: Add support for IPQ40xx ARM: mmp: replace setup_irq() by request_irq() ARM: cns3xxx: replace setup_irq() by request_irq() ARM: spear: replace setup_irq() by request_irq() ARM: ep93xx: Replace setup_irq() by request_irq() ARM: iop32x: replace setup_irq() by request_irq() arm: mach-dove: Mark dove_io_desc as __maybe_unused ARM: orion: replace setup_irq() by request_irq() ARM: debug: stm32: add UART early console support for STM32MP1 ARM: debug: stm32: add UART early console support for STM32H7 ARM: debug: stm32: add UART early console configuration for STM32F7 ARM: debug: stm32: add UART early console configuration for STM32F4 cpuidle: tegra: Disable CC6 state if LP2 unavailable cpuidle: tegra: Squash Tegra114 driver into the common driver cpuidle: tegra: Squash Tegra30 driver into the common driver cpuidle: Refactor and move out NVIDIA Tegra20 driver into drivers/cpuidle ARM: tegra: cpuidle: Remove unnecessary memory barrier ARM: tegra: cpuidle: Make abort_flag atomic ARM: tegra: cpuidle: Handle case where secondary CPU hangs on entering LP2 ARM: tegra: Make outer_disable() open-coded ...
2020-03-30Merge branches 'pm-core', 'pm-sleep', 'pm-acpi' and 'pm-domains'Rafael J. Wysocki
* pm-core: PM: runtime: Add pm_runtime_get_if_active() * pm-sleep: PM: sleep: wakeup: Skip wakeup_source_sysfs_remove() if device is not there PM / hibernate: Remove unnecessary compat ioctl overrides PM: hibernate: fix docs for ioctls that return loff_t via pointer PM: sleep: wakeup: Use built-in RCU list checking PM: sleep: core: Use built-in RCU list checking * pm-acpi: ACPI: PM: s2idle: Refine active GPEs check ACPICA: Allow acpi_any_gpe_status_set() to skip one GPE ACPI: PM: s2idle: Fix comment in acpi_s2idle_prepare_late() * pm-domains: cpuidle: psci: Split psci_dt_cpu_init_idle() PM / Domains: Allow no domain-idle-states DT property in genpd when parsing
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