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2020-02-03intel_idle: Introduce 'states_off' module parameterRafael J. Wysocki1-3/+20
In certain system configurations it may not be desirable to use some C-states assumed to be available by intel_idle and the driver needs to be prevented from using them even before the cpuidle sysfs interface becomes accessible to user space. Currently, the only way to achieve that is by setting the 'max_cstate' module parameter to a value lower than the index of the shallowest of the C-states in question, but that may be overly intrusive, because it effectively makes all of the idle states deeper than the 'max_cstate' one go away (and the C-state to avoid may be in the middle of the range normally regarded as available). To allow that limitation to be overcome, introduce a new module parameter called 'states_off' to represent a list of idle states to be disabled by default in the form of a bitmask and update the documentation to cover it. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-02-03intel_idle: Introduce 'use_acpi' module parameterRafael J. Wysocki1-2/+9
For diagnostics, it is generally useful to be able to make intel_idle take the system's ACPI tables into consideration even if that is not required for the processor model in there, so introduce a new module parameter, 'use_acpi', to make that happen and update the documentation to cover it. While at it, fix the 'no_acpi' module parameter name in the documentation. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-01-28Merge branch 'x86-cpu-for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 cpu-features updates from Ingo Molnar: "The biggest change in this cycle was a large series from Sean Christopherson to clean up the handling of VMX features. This both fixes bugs/inconsistencies and makes the code more coherent and future-proof. There are also two cleanups and a minor TSX syslog messages enhancement" * 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits) x86/cpu: Remove redundant cpu_detect_cache_sizes() call x86/cpu: Print "VMX disabled" error message iff KVM is enabled KVM: VMX: Allow KVM_INTEL when building for Centaur and/or Zhaoxin CPUs perf/x86: Provide stubs of KVM helpers for non-Intel CPUs KVM: VMX: Use VMX_FEATURE_* flags to define VMCS control bits KVM: VMX: Check for full VMX support when verifying CPU compatibility KVM: VMX: Use VMX feature flag to query BIOS enabling KVM: VMX: Drop initialization of IA32_FEAT_CTL MSR x86/cpufeatures: Add flag to track whether MSR IA32_FEAT_CTL is configured x86/cpu: Set synthetic VMX cpufeatures during init_ia32_feat_ctl() x86/cpu: Print VMX flags in /proc/cpuinfo using VMX_FEATURES_* x86/cpu: Detect VMX features on Intel, Centaur and Zhaoxin CPUs x86/vmx: Introduce VMX_FEATURES_* x86/cpu: Clear VMX feature flag if VMX is not fully enabled x86/zhaoxin: Use common IA32_FEAT_CTL MSR initialization x86/centaur: Use common IA32_FEAT_CTL MSR initialization x86/mce: WARN once if IA32_FEAT_CTL MSR is left unlocked x86/intel: Initialize IA32_FEAT_CTL MSR at boot tools/x86: Sync msr-index.h from kernel sources selftests, kvm: Replace manual MSR defs with common msr-index.h ...
2020-01-23intel_idle: Clean up irtl_2_usec()Rafael J. Wysocki1-8/+10
Move the irtl_ns_units[] definition into irtl_2_usec() which is the only user of it, use div_u64() for the division in there (as the divisor is small enough) and use the NSEC_PER_USEC symbol for the divisor. Also convert the irtl_2_usec() comment to a proper kerneldo one. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-01-23intel_idle: Move 3 functions closer to their callersRafael J. Wysocki1-33/+34
Move intel_idle_verify_cstate(), auto_demotion_disable() and c1e_promotion_disable() closer to their callers. While at it, annotate intel_idle_verify_cstate() with __init, as it is only used during the initialization of the driver. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-01-23intel_idle: Annotate initialization code and data structuresRafael J. Wysocki1-13/+14
Annotate the functions that are only used at the initialization time with __init and the data structures used by them with __initdata or __initconst. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-01-23intel_idle: Move and clean up intel_idle_cpuidle_devices_uninit()Rafael J. Wysocki1-15/+11
Move intel_idle_cpuidle_devices_uninit() closer to its caller, intel_idle_init(), add the __init modifier to its header, drop a redundant local variable from it and fix up its kerneldoc comment. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-01-23intel_idle: Rearrange intel_idle_cpuidle_driver_init()Rafael J. Wysocki1-18/+6
Notice that intel_idle_state_table_update() only needs to be called if icpu is not NULL, so fold it into intel_idle_init_cstates_icpu(), and pass a pointer to the driver object to intel_idle_cpuidle_driver_init() as an argument instead of referencing it locally in there. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-01-23intel_idle: Clean up NULL pointer check in intel_idle_init()Rafael J. Wysocki1-1/+1
Instead of comparing intel_idle_cpuidle_devices with NULL apply the "!" (not) operator to it when checking it against NULL. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-01-23intel_idle: Fold intel_idle_probe() into intel_idle_init()Rafael J. Wysocki1-55/+42
There is no particular reason why intel_idle_probe() needs to be a separate function and folding it into intel_idle_init() causes the code to be somewhat easier to follow, so do just that. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-01-23intel_idle: Eliminate __setup_broadcast_timer()Rafael J. Wysocki1-9/+1
The __setup_broadcast_timer() static function is only called in one place and "true" is passed to it as the argument in there, so effectively it is a wrapper arround tick_broadcast_enable(). To simplify the code, call tick_broadcast_enable() directly instead of __setup_broadcast_timer() and drop the latter. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-01-13x86/msr-index: Clean up bit defines for IA32_FEATURE_CONTROL MSRSean Christopherson1-1/+1
As pointed out by Boris, the defines for bits in IA32_FEATURE_CONTROL are quite a mouthful, especially the VMX bits which must differentiate between enabling VMX inside and outside SMX (TXT) operation. Rename the MSR and its bit defines to abbreviate FEATURE_CONTROL as FEAT_CTL to make them a little friendlier on the eyes. Arguably, the MSR itself should keep the full IA32_FEATURE_CONTROL name to match Intel's SDM, but a future patch will add a dedicated Kconfig, file and functions for the MSR. Using the full name for those assets is rather unwieldy, so bite the bullet and use IA32_FEAT_CTL so that its nomenclature is consistent throughout the kernel. Opportunistically, fix a few other annoyances with the defines: - Relocate the bit defines so that they immediately follow the MSR define, e.g. aren't mistaken as belonging to MISC_FEATURE_CONTROL. - Add whitespace around the block of feature control defines to make it clear they're all related. - Use BIT() instead of manually encoding the bit shift. - Use "VMX" instead of "VMXON" to match the SDM. - Append "_ENABLED" to the LMCE (Local Machine Check Exception) bit to be consistent with the kernel's verbiage used for all other feature control bits. Note, the SDM refers to the LMCE bit as LMCE_ON, likely to differentiate it from IA32_MCG_EXT_CTL.LMCE_EN. Ignore the (literal) one-off usage of _ON, the SDM is simply "wrong". Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20191221044513.21680-2-sean.j.christopherson@intel.com
2019-12-27intel_idle: Use ACPI _CST on server systemsRafael J. Wysocki1-20/+50
In many cases, especially on server systems, it is desirable to avoid enabling C-states that have been disabled in the platform firmware (BIOS) setup, except for C1E. As a rule, the C-states disabled this way are not listed by ACPI _CST, so if that is used by intel_idle along with the specific table of C-states that it has for the given processor, the C-states disabled through the platform firmware will not be enabled by default by intel_idle. Accordingly, set the use_acpi flag (introduced previously) in all server processor profiles defined in intel_idle (so as to make it use ACPI _CST to decide which C-states to enable by default) and set the CPUIDLE_FLAG_ALWAYS_ENABLE flag (also introduced previously) for C1E in all C-states tables in intel_idle that contain C1 too (so that C1E is enabled regardless of whether or not it is listed by ACPI _CST). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-12-27intel_idle: Add module parameter to prevent ACPI _CST from being usedRafael J. Wysocki1-0/+9
Add a new module parameter called "no_acpi" to the intel_idle driver to allow the driver to be prevented from using ACPI _CST via kernel command line. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-12-27intel_idle: Allow ACPI _CST to be used for selected known processorsRafael J. Wysocki1-3/+42
Update the intel_idle driver to get the C-states information from ACPI _CST in some cases in which the processor is known to the driver, as long as that information is available and the new use_acpi flag is set in the profile of the processor in question. In the cases when there is a specific table of C-states for the given processor in the driver, that table is used as the primary source of information on the available C-states, but if ACPI _CST is present, the C-states that are not listed by it will not be enabled by default (they still can be enabled later by user space via sysfs, though). The new CPUIDLE_FLAG_ALWAYS_ENABLE flag can be used for marking C-states that should be enabled by default even if they are not listed by ACPI _CST. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-12-27intel_idle: Use ACPI _CST for processor models without C-state tablesRafael J. Wysocki1-28/+162
Modify the intel_idle driver to get the C-states information from ACPI _CST if the processor model is not recognized by it. The processor is still required to support MWAIT and the information from ACPI _CST will only be used if all of the C-states listed by _CST are of the ACPI_CSTATE_FFH type (which means that they are expected to be entered via MWAIT). Moreover, the driver assumes that the _CST information is the same for all CPUs in the system, so it is sufficient to evaluate _CST for one of them and extract the common list of C-states from there. Also _CST is evaluated once at the system initialization time and the driver does not respond to _CST change notifications (that can be changed in the future). The main functional difference between intel_idle with this change and the ACPI processor driver is that the former sets the target residency to be equal to the exit latency (provided by _CST) for C1-type C-states and to 3 times the exit latency value for the other C-state types, whereas the latter obtains the target residency by multiplying the exit latency by the same number (2 by default) for all C-state types. Therefore it is expected that in general using the former instead of the latter on the same system will lead to improved energy-efficiency. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-12-27intel_idle: Refactor intel_idle_cpuidle_driver_init()Rafael J. Wysocki1-24/+25
Move the C-state verification and checks from intel_idle_cpuidle_driver_init() to a separate function, intel_idle_verify_cstate(), and make the former call it after checking the CPUIDLE_FLAG_UNUSABLE state flag. Also combine the drv->states[] updates with the incrementation of drv->state_count. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-11-29cpuidle: Drop disabled field from struct cpuidle_stateRafael J. Wysocki1-3/+3
After recent cpuidle updates the "disabled" field in struct cpuidle_state is only used by two drivers (intel_idle and shmobile cpuidle) for marking unusable idle states, but that may as well be achieved with the help of a state flag, so define an "unusable" idle state flag, CPUIDLE_FLAG_UNUSABLE, make the drivers in question use it instead of the "disabled" field and make the core set CPUIDLE_STATE_DISABLED_BY_DRIVER for the idle states with that flag set. After the above changes, the "disabled" field in struct cpuidle_state is not used any more, so drop it. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-08-28x86/intel: Aggregate microserver namingPeter Zijlstra1-4/+4
Currently big microservers have _XEON_D while small microservers have _X, Make it uniformly: _D. for i in `git grep -l "\(INTEL_FAM6_\|VULNWL_INTEL\|INTEL_CPU_FAM6\).*_\(X\|XEON_D\)"` do sed -i -e 's/\(\(INTEL_FAM6_\|VULNWL_INTEL\|INTEL_CPU_FAM6\).*ATOM.*\)_X/\1_D/g' \ -e 's/\(\(INTEL_FAM6_\|VULNWL_INTEL\|INTEL_CPU_FAM6\).*\)_XEON_D/\1_D/g' ${i} done Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Tony Luck <tony.luck@intel.com> Cc: x86@kernel.org Cc: Dave Hansen <dave.hansen@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@alien8.de> Link: https://lkml.kernel.org/r/20190827195122.677152989@infradead.org
2019-08-28x86/intel: Aggregate big core graphics namingPeter Zijlstra1-2/+2
Currently big core clients with extra graphics on have: - _G - _GT3E Make it uniformly: _G for i in `git grep -l "\(INTEL_FAM6_\|VULNWL_INTEL\|INTEL_CPU_FAM6\).*_GT3E"` do sed -i -e 's/\(\(INTEL_FAM6_\|VULNWL_INTEL\|INTEL_CPU_FAM6\).*\)_GT3E/\1_G/g' ${i} done Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Tony Luck <tony.luck@intel.com> Cc: x86@kernel.org Cc: Dave Hansen <dave.hansen@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@alien8.de> Link: https://lkml.kernel.org/r/20190827195122.622802314@infradead.org
2019-08-28x86/intel: Aggregate big core mobile namingPeter Zijlstra1-3/+3
Currently big core mobile chips have either: - _L - _ULT - _MOBILE Make it uniformly: _L. for i in `git grep -l "\(INTEL_FAM6_\|VULNWL_INTEL\|INTEL_CPU_FAM6\).*_\(MOBILE\|ULT\)"` do sed -i -e 's/\(\(INTEL_FAM6_\|VULNWL_INTEL\|INTEL_CPU_FAM6\).*\)_\(MOBILE\|ULT\)/\1_L/g' ${i} done Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Tony Luck <tony.luck@intel.com> Cc: x86@kernel.org Cc: Dave Hansen <dave.hansen@intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190827195122.568978530@infradead.org
2019-08-28x86/intel: Aggregate big core client namingPeter Zijlstra1-5/+5
Currently the big core client models either have: - no OPTDIFF - _CORE - _DESKTOP Make it uniformly: 'no OPTDIFF'. for i in `git grep -l "\(INTEL_FAM6_\|VULNWL_INTEL\|INTEL_CPU_FAM6\).*_\(CORE\|DESKTOP\)"` do sed -i -e 's/\(\(INTEL_FAM6_\|VULNWL_INTEL\|INTEL_CPU_FAM6\).*\)_\(CORE\|DESKTOP\)/\1/g' ${i} done Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Tony Luck <tony.luck@intel.com> Cc: x86@kernel.org Cc: Dave Hansen <dave.hansen@intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190827195122.513945586@infradead.org
2019-06-05treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 335Thomas Gleixner1-13/+1
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 111 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.567572064@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-21treewide: Add SPDX license identifier - Makefile/KconfigThomas Gleixner2-0/+2
Add SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any form These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-15intel_idle: add support for JacobsvilleZhang Rui1-0/+1
Jacobsville uses the same C-states as Denverton. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-10-23Merge branch 'perf-core-for-linus' of ↵Linus Torvalds1-9/+9
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf updates from Ingo Molnar: "The main updates in this cycle were: - Lots of perf tooling changes too voluminous to list (big perf trace and perf stat improvements, lots of libtraceevent reorganization, etc.), so I'll list the authors and refer to the changelog for details: Benjamin Peterson, Jérémie Galarneau, Kim Phillips, Peter Zijlstra, Ravi Bangoria, Sangwon Hong, Sean V Kelley, Steven Rostedt, Thomas Gleixner, Ding Xiang, Eduardo Habkost, Thomas Richter, Andi Kleen, Sanskriti Sharma, Adrian Hunter, Tzvetomir Stoyanov, Arnaldo Carvalho de Melo, Jiri Olsa. ... with the bulk of the changes written by Jiri Olsa, Tzvetomir Stoyanov and Arnaldo Carvalho de Melo. - Continued intel_rdt work with a focus on playing well with perf events. This also imported some non-perf RDT work due to dependencies. (Reinette Chatre) - Implement counter freezing for Arch Perfmon v4 (Skylake and newer). This allows to speed up the PMI handler by avoiding unnecessary MSR writes and make it more accurate. (Andi Kleen) - kprobes cleanups and simplification (Masami Hiramatsu) - Intel Goldmont PMU updates (Kan Liang) - ... plus misc other fixes and updates" * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (155 commits) kprobes/x86: Use preempt_enable() in optimized_callback() x86/intel_rdt: Prevent pseudo-locking from using stale pointers kprobes, x86/ptrace.h: Make regs_get_kernel_stack_nth() not fault on bad stack perf/x86/intel: Export mem events only if there's PEBS support x86/cpu: Drop pointless static qualifier in punit_dev_state_show() x86/intel_rdt: Fix initial allocation to consider CDP x86/intel_rdt: CBM overlap should also check for overlap with CDP peer x86/intel_rdt: Introduce utility to obtain CDP peer tools lib traceevent, perf tools: Move struct tep_handler definition in a local header file tools lib traceevent: Separate out tep_strerror() for strerror_r() issues perf python: More portable way to make CFLAGS work with clang perf python: Make clang_has_option() work on Python 3 perf tools: Free temporary 'sys' string in read_event_files() perf tools: Avoid double free in read_event_file() perf tools: Free 'printk' string in parse_ftrace_printk() perf tools: Cleanup trace-event-info 'tdata' leak perf strbuf: Match va_{add,copy} with va_end perf test: S390 does not support watchpoints in test 22 perf auxtrace: Include missing asm/bitsperlong.h to get BITS_PER_LONG tools include: Adopt linux/bits.h ...
2018-10-02x86/cpu: Sanitize FAM6_ATOM namingPeter Zijlstra1-9/+9
Going primarily by: https://en.wikipedia.org/wiki/List_of_Intel_Atom_microprocessors with additional information gleaned from other related pages; notably: - Bonnell shrink was called Saltwell - Moorefield is the Merriefield refresh which makes it Airmont The general naming scheme is: FAM6_ATOM_UARCH_SOCTYPE for i in `git grep -l FAM6_ATOM` ; do sed -i -e 's/ATOM_PINEVIEW/ATOM_BONNELL/g' \ -e 's/ATOM_LINCROFT/ATOM_BONNELL_MID/' \ -e 's/ATOM_PENWELL/ATOM_SALTWELL_MID/g' \ -e 's/ATOM_CLOVERVIEW/ATOM_SALTWELL_TABLET/g' \ -e 's/ATOM_CEDARVIEW/ATOM_SALTWELL/g' \ -e 's/ATOM_SILVERMONT1/ATOM_SILVERMONT/g' \ -e 's/ATOM_SILVERMONT2/ATOM_SILVERMONT_X/g' \ -e 's/ATOM_MERRIFIELD/ATOM_SILVERMONT_MID/g' \ -e 's/ATOM_MOOREFIELD/ATOM_AIRMONT_MID/g' \ -e 's/ATOM_DENVERTON/ATOM_GOLDMONT_X/g' \ -e 's/ATOM_GEMINI_LAKE/ATOM_GOLDMONT_PLUS/g' ${i} done Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: dave.hansen@linux.intel.com Cc: len.brown@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-09-10intel_idle: Get rid of custom ICPU() macroAndy Shevchenko1-39/+36
Replace custom grown macro with generic INTEL_CPU_FAM6() one. No functional change intended. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-11-13Merge branch 'pm-cpuidle'Rafael J. Wysocki1-6/+17
* pm-cpuidle: intel_idle: Graceful probe failure when MWAIT is disabled cpuidle: Avoid assignment in if () argument cpuidle: Clean up cpuidle_enable_device() error handling a bit cpuidle: ladder: Add per CPU PM QoS resume latency support ARM: cpuidle: Refactor rollback operations if init fails ARM: cpuidle: Correct driver unregistration if init fails intel_idle: replace conditionals with static_cpu_has(X86_FEATURE_ARAT) cpuidle: fix broadcast control when broadcast can not be entered Conflicts: drivers/idle/intel_idle.c
2017-11-09intel_idle: Graceful probe failure when MWAIT is disabledLen Brown1-1/+6
When MWAIT is disabled, intel_idle refuses to probe. But it may mis-lead the user by blaming this on the model number: intel_idle: does not run on family 6 modesl 79 So defer the check for MWAIT until after the model# white-list check succeeds, and if the MWAIT check fails, tell the user how to fix it: intel_idle: Please enable MWAIT in BIOS SETUP Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-11-04Revert "x86/mm: Stop calling leave_mm() in idle code"Andy Lutomirski1-4/+5
This reverts commit 43858b4f25cf0adc5c2ca9cf5ce5fdf2532941e5. The reason I removed the leave_mm() calls in question is because the heuristic wasn't needed after that patch. With the original version of my PCID series, we never flushed a "lazy cpu" (i.e. a CPU running kernel thread) due a flush on the loaded mm. Unfortunately, that caused architectural issues, so now I've reinstated these flushes on non-PCID systems in: commit b956575bed91 ("x86/mm: Flush more aggressively in lazy TLB mode"). That, in turn, gives us a power management and occasionally performance regression as compared to old kernels: a process that goes into a deep idle state on a given CPU and gets its mm flushed due to activity on a different CPU will wake the idle CPU. Reinstate the old ugly heuristic: if a CPU goes into ACPI C3 or an intel_idle state that is likely to cause a TLB flush gets its mm switched to init_mm before going idle. FWIW, this heuristic is lousy. Whether we should change CR3 before idle isn't a good hint except insofar as the performance hit is a bit lower if the TLB is getting flushed by the idle code anyway. What we really want to know is whether we anticipate being idle long enough that the mm is likely to be flushed before we wake up. This is more a matter of the expected latency than the idle state that gets chosen. This heuristic also completely fails on systems that don't know whether the TLB will be flushed (e.g. AMD systems?). OTOH it may be a bit obsolete anyway -- PCID systems don't presently benefit from this heuristic at all. We also shouldn't do this callback from innermost bit of the idle code due to the RCU nastiness it causes. All the information need is available before rcu_idle_enter() needs to happen. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bpetkov@suse.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 43858b4f25cf "x86/mm: Stop calling leave_mm() in idle code" Link: http://lkml.kernel.org/r/c513bbd4e653747213e05bc7062de000bf0202a5.1509793738.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-10-11intel_idle: replace conditionals with static_cpu_has(X86_FEATURE_ARAT)Jason Baron1-5/+11
If the 'arat' cpu flag is set, then the conditionals in intel_idle() that guard calling tick_broadcast_enter()/exit() will never be true. Use static_cpu_has(X86_FEATURE_ARAT) to create a fast path to replace the conditional. Signed-off-by: Jason Baron <jbaron@akamai.com> Acked-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-09-05Merge tag 'pm-4.14-rc1' of ↵Linus Torvalds1-90/+91
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull power management updates from Rafael Wysocki: "This time (again) cpufreq gets the majority of changes which mostly are driver updates (including a major consolidation of intel_pstate), some schedutil governor modifications and core cleanups. There also are some changes in the system suspend area, mostly related to diagnostics and debug messages plus some renames of things related to suspend-to-idle. One major change here is that suspend-to-idle is now going to be preferred over S3 on systems where the ACPI tables indicate to do so and provide requsite support (the Low Power Idle S0 _DSM in particular). The system sleep documentation and the tools related to it are updated too. The rest is a few cpuidle changes (nothing major), devfreq updates, generic power domains (genpd) framework updates and a few assorted modifications elsewhere. Specifics: - Drop the P-state selection algorithm based on a PID controller from intel_pstate and make it use the same P-state selection method (based on the CPU load) for all types of systems in the active mode (Rafael Wysocki, Srinivas Pandruvada). - Rework the cpufreq core and governors to make it possible to take cross-CPU utilization updates into account and modify the schedutil governor to actually do so (Viresh Kumar). - Clean up the handling of transition latency information in the cpufreq core and untangle it from the information on which drivers cannot do dynamic frequency switching (Viresh Kumar). - Add support for new SoCs (MT2701/MT7623 and MT7622) to the mediatek cpufreq driver and update its DT bindings (Sean Wang). - Modify the cpufreq dt-platdev driver to autimatically create cpufreq devices for the new (v2) Operating Performance Points (OPP) DT bindings and update its whitelist of supported systems (Viresh Kumar, Shubhrajyoti Datta, Marc Gonzalez, Khiem Nguyen, Finley Xiao). - Add support for Ux500 to the cpufreq-dt driver and drop the obsolete dbx500 cpufreq driver (Linus Walleij, Arnd Bergmann). - Add new SoC (R8A7795) support to the cpufreq rcar driver (Khiem Nguyen). - Fix and clean up assorted issues in the cpufreq drivers and core (Arvind Yadav, Christophe Jaillet, Colin Ian King, Gustavo Silva, Julia Lawall, Leonard Crestez, Rob Herring, Sudeep Holla). - Update the IO-wait boost handling in the schedutil governor to make it less aggressive (Joel Fernandes). - Rework system suspend diagnostics to make it print fewer messages to the kernel log by default, add a sysfs knob to allow more suspend-related messages to be printed and add Low Power S0 Idle constraints checks to the ACPI suspend-to-idle code (Rafael Wysocki, Srinivas Pandruvada). - Prefer suspend-to-idle over S3 on ACPI-based systems with the ACPI_FADT_LOW_POWER_S0 flag set and the Low Power Idle S0 _DSM interface present in the ACPI tables (Rafael Wysocki). - Update documentation related to system sleep and rename a number of items in the code to make it cleare that they are related to suspend-to-idle (Rafael Wysocki). - Export a variable allowing device drivers to check the target system sleep state from the core system suspend code (Florian Fainelli). - Clean up the cpuidle subsystem to handle the polling state on x86 in a more straightforward way and to use %pOF instead of full_name (Rafael Wysocki, Rob Herring). - Update the devfreq framework to fix and clean up a few minor issues (Chanwoo Choi, Rob Herring). - Extend diagnostics in the generic power domains (genpd) framework and clean it up slightly (Thara Gopinath, Rob Herring). - Fix and clean up a couple of issues in the operating performance points (OPP) framework (Viresh Kumar, Waldemar Rymarkiewicz). - Add support for RV1108 to the rockchip-io Adaptive Voltage Scaling (AVS) driver (David Wu). - Fix the usage of notifiers in CPU power management on some platforms (Alex Shi). - Update the pm-graph system suspend/hibernation and boot profiling utility (Todd Brandt). - Make it possible to run the cpupower utility without CPU0 (Prarit Bhargava)" * tag 'pm-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (87 commits) cpuidle: Make drivers initialize polling state cpuidle: Move polling state initialization code to separate file cpuidle: Eliminate the CPUIDLE_DRIVER_STATE_START symbol cpufreq: imx6q: Fix imx6sx low frequency support cpufreq: speedstep-lib: make several arrays static, makes code smaller PM: docs: Delete the obsolete states.txt document PM: docs: Describe high-level PM strategies and sleep states PM / devfreq: Fix memory leak when fail to register device PM / devfreq: Add dependency on PM_OPP PM / devfreq: Move private devfreq_update_stats() into devfreq PM / devfreq: Convert to using %pOF instead of full_name PM / AVS: rockchip-io: add io selectors and supplies for RV1108 cpufreq: ti: Fix 'of_node_put' being called twice in error handling path cpufreq: dt-platdev: Drop few entries from whitelist cpufreq: dt-platdev: Automatically create cpufreq device with OPP v2 ARM: ux500: don't select CPUFREQ_DT cpuidle: Convert to using %pOF instead of full_name cpufreq: Convert to using %pOF instead of full_name PM / Domains: Convert to using %pOF instead of full_name cpufreq: Cap the default transition delay value to 10 ms ...
2017-09-04Merge branch 'pm-sleep'Rafael J. Wysocki1-90/+90
* pm-sleep: ACPI / PM: Check low power idle constraints for debug only PM / s2idle: Rename platform operations structure PM / s2idle: Rename ->enter_freeze to ->enter_s2idle PM / s2idle: Rename freeze_state enum and related items PM / s2idle: Rename PM_SUSPEND_FREEZE to PM_SUSPEND_TO_IDLE ACPI / PM: Prefer suspend-to-idle over S3 on some systems platform/x86: intel-hid: Wake up Dell Latitude 7275 from suspend-to-idle PM / suspend: Define pr_fmt() in suspend.c PM / suspend: Use mem_sleep_labels[] strings in messages PM / sleep: Put pm_test under CONFIG_PM_SLEEP_DEBUG PM / sleep: Check pm_wakeup_pending() in __device_suspend_noirq() PM / core: Add error argument to dpm_show_time() PM / core: Split dpm_suspend_noirq() and dpm_resume_noirq() PM / s2idle: Rearrange the main suspend-to-idle loop PM / timekeeping: Print debug messages when requested PM / sleep: Mark suspend/hibernation start and finish PM / sleep: Do not print debug messages by default PM / suspend: Export pm_suspend_target_state
2017-08-30cpuidle: Make drivers initialize polling stateRafael J. Wysocki1-0/+1
Make the drivers that want to include the polling state into their states table initialize it explicitly and drop the initialization of it (which in fact is conditional, but that is not obvious from the code) from the core. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2017-08-11PM / s2idle: Rename ->enter_freeze to ->enter_s2idleRafael J. Wysocki1-90/+90
Rename the ->enter_freeze cpuidle driver callback to ->enter_s2idle to make it clear that it is used for entering suspend-to-idle and rename the related functions, variables and so on accordingly. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-07-18Merge branch 'x86/boot' into x86/mm, to pick up interacting changesIngo Molnar1-16/+16
The SME patches we are about to apply add some E820 logic, so merge in pending E820 code changes first, to have a single code base. Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-07-05x86/mm: Stop calling leave_mm() in idle codeAndy Lutomirski1-5/+4
Now that lazy TLB suppresses all flush IPIs (as opposed to all but the first), there's no need to leave_mm() when going idle. This means we can get rid of the rcuidle hack in switch_mm_irqs_off() and we can unexport leave_mm(). This also removes acpi_unlazy_tlb() from the x86 and ia64 headers, since it has no callers any more. Signed-off-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Nadav Amit <nadav.amit@gmail.com> Reviewed-by: Borislav Petkov <bp@suse.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/03c699cfd6021e467be650d6b73deaccfe4b4bd7.1498751203.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-06-29intel_idle: Use more common logging styleJoe Perches1-16/+16
Remove #define PREFIX and add #define pr_fmt to use more common logging. Miscellanea: o Add missing newline to format o Convert a single printk without KERN_<LEVEL> to pr_info Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-05-02x86/intel_idle: add Gemini Lake supportDavid E. Box1-0/+2
Gemini Lake uses the same C-states as Broxton and also uses the IRTL MSR's to determine maximum C-state latency. Signed-off-by: David E. Box <david.e.box@linux.intel.com> Acked-by: Len Brown <len.brown@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-03-03Merge tag 'pm-turbostat-4.11-rc1' of ↵Linus Torvalds1-3/+3
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull turbostat utility updates from Rafael Wysocki: "Power management turbostat utility updates. These update turbostat significantly and in particular: - default output is now verbose, --debug is no longer required to get all counters. As a result, some options have been added to specify exactly what output is wanted. - added --quiet to skip system configuration output - added --list, --show and --hide parameters - added --cpu parameter - enhanced Baytrail SoC support - added Gemini Lake SoC support - added sysfs C-state columns Also the symbol definitions in arch/x86/include/asm/intel-family.h and arch/x86/include/asm/msr-index.h are updated and the intel_idle and intel_pstate drivers are modified to use the updated symbols. Credits to Len Brown for all of these changes" * tag 'pm-turbostat-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (44 commits) tools/power turbostat: version 17.02.24 tools/power turbostat: bugfix: --add u32 was printed as u64 tools/power turbostat: show error on exec tools/power turbostat: dump p-state software config tools/power turbostat: show package number, even without --debug tools/power turbostat: support "--hide C1" etc. tools/power turbostat: move --Package and --processor into the --cpu option tools/power turbostat: turbostat.8 update tools/power turbostat: update --list feature tools/power turbostat: use wide columns to display large numbers tools/power turbostat: Add --list option to show available header names tools/power turbostat: fix zero IRQ count shown in one-shot command mode tools/power turbostat: add --cpu parameter tools/power turbostat: print sysfs C-state stats tools/power turbostat: extend --add option to accept /sys path tools/power turbostat: skip unused counters on BDX tools/power turbostat: fix decoding for GLM, DNV, SKX turbo-ratio limits tools/power turbostat: skip unused counters on SKX tools/power turbostat: Denverton: use HW CC1 counter, skip C3, C7 tools/power turbostat: initial Gemini Lake SOC support ...
2017-03-01intel_idle: use new name for MSR_PKG_CST_CONFIG_CONTROLLen Brown1-3/+3
previously known as MSR_NHM_SNB_PKG_CST_CFG_CTL Signed-off-by: Len Brown <len.brown@intel.com>
2017-03-01intel_idle: stop exposing platform acronyms in sysfsLen Brown1-86/+86
Cosmetic only -- no functional change in this patch. sysfs before: state4/desc:MWAIT 0x20 state4/name:C6-HSW sysfs after: state4/desc:MWAIT 0x20 state4/name:C6 We remove the platform acronyms from the end of the state name (-HSW in this case) for three reasonse. 1. more consistency with acpi_idle, which prints C1, C2, C3 etc. 2. users know what platform they are on already an acronym for the processor code name here seems to cause more confusion than clarity. 3. less clutter in "cpupower monitor" output, which truncates the names to 4 columns. The precise definition of the state continues to be available in "desc". Reported-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-12-13Merge tag 'pm-4.10-rc1' of ↵Linus Torvalds1-65/+89
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull power management updates from Rafael Wysocki: "Again, cpufreq gets more changes than the other parts this time (one new driver, one old driver less, a bunch of enhancements of the existing code, new CPU IDs, fixes, cleanups) There also are some changes in cpuidle (idle injection rework, a couple of new CPU IDs, online/offline rework in intel_idle, fixes and cleanups), in the generic power domains framework (mostly related to supporting power domains containing CPUs), and in the Operating Performance Points (OPP) library (mostly related to supporting devices with multiple voltage regulators) In addition to that, the system sleep state selection interface is modified to make it easier for distributions with unchanged user space to support suspend-to-idle as the default system suspend method, some issues are fixed in the PM core, the latency tolerance PM QoS framework is improved a bit, the Intel RAPL power capping driver is cleaned up and there are some fixes and cleanups in the devfreq subsystem Specifics: - New cpufreq driver for Broadcom STB SoCs and a Device Tree binding for it (Markus Mayer) - Support for ARM Integrator/AP and Integrator/CP in the generic DT cpufreq driver and elimination of the old Integrator cpufreq driver (Linus Walleij) - Support for the zx296718, r8a7743 and r8a7745, Socionext UniPhier, and PXA SoCs in the the generic DT cpufreq driver (Baoyou Xie, Geert Uytterhoeven, Masahiro Yamada, Robert Jarzmik) - cpufreq core fix to eliminate races that may lead to using inactive policy objects and related cleanups (Rafael Wysocki) - cpufreq schedutil governor update to make it use SCHED_FIFO kernel threads (instead of regular workqueues) for doing delayed work (to reduce the response latency in some cases) and related cleanups (Viresh Kumar) - New cpufreq sysfs attribute for resetting statistics (Markus Mayer) - cpufreq governors fixes and cleanups (Chen Yu, Stratos Karafotis, Viresh Kumar) - Support for using generic cpufreq governors in the intel_pstate driver (Rafael Wysocki) - Support for per-logical-CPU P-state limits and the EPP/EPB (Energy Performance Preference/Energy Performance Bias) knobs in the intel_pstate driver (Srinivas Pandruvada) - New CPU ID for Knights Mill in intel_pstate (Piotr Luc) - intel_pstate driver modification to use the P-state selection algorithm based on CPU load on platforms with the system profile in the ACPI tables set to "mobile" (Srinivas Pandruvada) - intel_pstate driver cleanups (Arnd Bergmann, Rafael Wysocki, Srinivas Pandruvada) - cpufreq powernv driver updates including fast switching support (for the schedutil governor), fixes and cleanus (Akshay Adiga, Andrew Donnellan, Denis Kirjanov) - acpi-cpufreq driver rework to switch it over to the new CPU offline/online state machine (Sebastian Andrzej Siewior) - Assorted cleanups in cpufreq drivers (Wei Yongjun, Prashanth Prakash) - Idle injection rework (to make it use the regular idle path instead of a home-grown custom one) and related powerclamp thermal driver updates (Peter Zijlstra, Jacob Pan, Petr Mladek, Sebastian Andrzej Siewior) - New CPU IDs for Atom Z34xx and Knights Mill in intel_idle (Andy Shevchenko, Piotr Luc) - intel_idle driver cleanups and switch over to using the new CPU offline/online state machine (Anna-Maria Gleixner, Sebastian Andrzej Siewior) - cpuidle DT driver update to support suspend-to-idle properly (Sudeep Holla) - cpuidle core cleanups and misc updates (Daniel Lezcano, Pan Bian, Rafael Wysocki) - Preliminary support for power domains including CPUs in the generic power domains (genpd) framework and related DT bindings (Lina Iyer) - Assorted fixes and cleanups in the generic power domains (genpd) framework (Colin Ian King, Dan Carpenter, Geert Uytterhoeven) - Preliminary support for devices with multiple voltage regulators and related fixes and cleanups in the Operating Performance Points (OPP) library (Viresh Kumar, Masahiro Yamada, Stephen Boyd) - System sleep state selection interface rework to make it easier to support suspend-to-idle as the default system suspend method (Rafael Wysocki) - PM core fixes and cleanups, mostly related to the interactions between the system suspend and runtime PM frameworks (Ulf Hansson, Sahitya Tummala, Tony Lindgren) - Latency tolerance PM QoS framework imorovements (Andrew Lutomirski) - New Knights Mill CPU ID for the Intel RAPL power capping driver (Piotr Luc) - Intel RAPL power capping driver fixes, cleanups and switch over to using the new CPU offline/online state machine (Jacob Pan, Thomas Gleixner, Sebastian Andrzej Siewior) - Fixes and cleanups in the exynos-ppmu, exynos-nocp, rk3399_dmc, rockchip-dfi devfreq drivers and the devfreq core (Axel Lin, Chanwoo Choi, Javier Martinez Canillas, MyungJoo Ham, Viresh Kumar) - Fix for false-positive KASAN warnings during resume from ACPI S3 (suspend-to-RAM) on x86 (Josh Poimboeuf) - Memory map verification during resume from hibernation on x86 to ensure a consistent address space layout (Chen Yu) - Wakeup sources debugging enhancement (Xing Wei) - rockchip-io AVS driver cleanup (Shawn Lin)" * tag 'pm-4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (127 commits) devfreq: rk3399_dmc: Don't use OPP structures outside of RCU locks devfreq: rk3399_dmc: Remove dangling rcu_read_unlock() devfreq: exynos: Don't use OPP structures outside of RCU locks Documentation: intel_pstate: Document HWP energy/performance hints cpufreq: intel_pstate: Support for energy performance hints with HWP cpufreq: intel_pstate: Add locking around HWP requests PM / sleep: Print active wakeup sources when blocking on wakeup_count reads PM / core: Fix bug in the error handling of async suspend PM / wakeirq: Fix dedicated wakeirq for drivers not using autosuspend PM / Domains: Fix compatible for domain idle state PM / OPP: Don't WARN on multiple calls to dev_pm_opp_set_regulators() PM / OPP: Allow platform specific custom set_opp() callbacks PM / OPP: Separate out _generic_set_opp() PM / OPP: Add infrastructure to manage multiple regulators PM / OPP: Pass struct dev_pm_opp_supply to _set_opp_voltage() PM / OPP: Manage supply's voltage/current in a separate structure PM / OPP: Don't use OPP structure outside of rcu protected section PM / OPP: Reword binding supporting multiple regulators per device PM / OPP: Fix incorrect cpu-supply property in binding cpuidle: Add a kerneldoc comment to cpuidle_use_deepest_state() ..
2016-12-02intel_idle: Convert to hotplug state machineSebastian Andrzej Siewior1-64/+39
Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. The two smp_call_function_single() invocations in intel_idle_cpu_init() have been removed because intel_idle_cpu_init() is now invoked via the hotplug callback which runs on the target CPU. The IRQ-off calling convention for auto_demotion_disable() and c1e_promotion_disable() has not been preserved because only those two modify the MSR during CPU intialization. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-12-02intel_idle: Remove superfluous SMP fuction callAnna-Maria Gleixner1-2/+1
Since commit 1cf4f629d9d2 ("cpu/hotplug: Move online calls to hotplugged cpu") the CPU_ONLINE and CPU_DOWN_PREPARE notifiers are always run on the hot plugged CPU, and as of commit 3b9d6da67e11 ("cpu/hotplug: Fix rollback during error-out in __cpu_disable()") the CPU_DOWN_FAILED notifier also runs on the hot plugged CPU. This patch converts the SMP functional calls into direct calls. smp_function_call_single() executes the function with interrupts disabled. This calling convention is not preserved, because tick_broadcast_enable() and tick_braodcast_disable() handle interrupts themselves. Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-12-01x86/intel_idle: Add Knights Mill CPUIDPiotr Luc1-0/+1
Add Knights Mill (KNM) to the list of CPUIDs supported by intel_idle. Signed-off-by: Piotr Luc <piotr.luc@intel.com> Reviewed-by: Dave Hansen <dave.hansen@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
2016-12-01x86/intel_idle: Add CPU model 0x4a (Atom Z34xx series)Andy Shevchenko1-0/+49
Add CPU ID for Atom Z34xx processors. Datasheets indicate support for this, detailed information about potential quirks or limitations are missing, though. So we just reuse the definition from official BSP code. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
2016-11-18i7300_idle: Remove this driverLen Brown3-630/+0
In preparation for removing the idle_notifier, remove its only user, the i7300_idle driver. i7300_idle was deployed in 2008 to reduce idle memory power on systems using the i7300 chipset. The driver worked by throttling the fully-buffered DIMMs during idle periods using the IOAT DMA engine. The driver ran only on the i7300 chip-set, and no other hardware has used this mechanism. The driver no longer has a maintainer. Removing this driver will increase idle power on i7300 systems when they run the new kernel without the driver. Signed-off-by: Len Brown <len.brown@intel.com> Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: http://lkml.kernel.org/r/ad6a044e57cc75f44cc8621abe846e58f7882243.1479449716.git.len.brown@intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-10-08nmi_backtrace: generate one-line reports for idle cpusChris Metcalf1-2/+2
When doing an nmi backtrace of many cores, most of which are idle, the output is a little overwhelming and very uninformative. Suppress messages for cpus that are idling when they are interrupted and just emit one line, "NMI backtrace for N skipped: idling at pc 0xNNN". We do this by grouping all the cpuidle code together into a new .cpuidle.text section, and then checking the address of the interrupted PC to see if it lies within that section. This commit suitably tags x86 and tile idle routines, and only adds in the minimal framework for other architectures. Link: http://lkml.kernel.org/r/1472487169-14923-5-git-send-email-cmetcalf@mellanox.com Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Daniel Thompson <daniel.thompson@linaro.org> [arm] Tested-by: Petr Mladek <pmladek@suse.com> Cc: Aaron Tomlin <atomlin@redhat.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>