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Userspace apps might have to cut off parts off the
idle state name for display reasons.
Switch NHM-C1 to C1-NHM (and others) so that a cut off
name is unique and makes sense to the user.
Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: lenb@kernel.org
Signed-off-by: Len Brown <len.brown@intel.com>
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Just as we had to disable auto-demotion for NHM/WSM,
we need to do the same for Atom (Lincroft version).
In particular, auto-demotion will prevent Lincroft
from entering the S0i3 idle power saving state.
https://bugzilla.kernel.org/show_bug.cgi?id=25252
Signed-off-by: Len Brown <len.brown@intel.com>
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Hardware C-state auto-demotion is a mechanism where the HW overrides
the OS C-state request, instead demoting to a shallower state,
which is less expensive, but saves less power.
Modern Linux should generally get exactly the states it requests.
In particular, when a CPU is taken off-line, it must not be demoted, else
it can prevent the entire package from reaching deep C-states.
https://bugzilla.kernel.org/show_bug.cgi?id=25252
Signed-off-by: Len Brown <len.brown@intel.com>
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Fix a shutdown regression caused by 2a2d31c8dc6f ("intel_idle: open
broadcast clock event"). The clockevent framework can automatically
shutdown broadcast timers for hotremove CPUs. And we get a shutdown
regression when we shutdown broadcast timer for hot remove CPU, so just
delete some code.
Also fix some section mismatch.
Reported-by: Ari Savolainen <ari.m.savolainen@gmail.com>
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Tested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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events from the cpuidle layer
Currently intel_idle and acpi_idle driver show double cpu_idle "exit idle"
events -> this patch fixes it and makes cpu_idle events throwing less complex.
It also introduces cpu_idle events for all architectures which use
the cpuidle subsystem, namely:
- arch/arm/mach-at91/cpuidle.c
- arch/arm/mach-davinci/cpuidle.c
- arch/arm/mach-kirkwood/cpuidle.c
- arch/arm/mach-omap2/cpuidle34xx.c
- arch/drivers/acpi/processor_idle.c (for all cases, not only mwait)
- arch/x86/kernel/process.c (did throw events before, but was a mess)
- drivers/idle/intel_idle.c (did throw events before)
Convention should be:
Fire cpu_idle events inside the current pm_idle function (not somewhere
down the the callee tree) to keep things easy.
Current possible pm_idle functions in X86:
c1e_idle, poll_idle, cpuidle_idle_call, mwait_idle, default_idle
-> this is really easy is now.
This affects userspace:
The type field of the cpu_idle power event can now direclty get
mapped to:
/sys/devices/system/cpu/cpuX/cpuidle/stateX/{name,desc,usage,time,...}
instead of throwing very CPU/mwait specific values.
This change is not visible for the intel_idle driver.
For the acpi_idle driver it should only be visible if the vendor
misses out C-states in his BIOS.
Another (perf timechart) patch reads out cpuidle info of cpu_idle
events from:
/sys/.../cpuidle/stateX/*, then the cpuidle events are mapped
to the correct C-/cpuidle state again, even if e.g. vendors miss
out C-states in their BIOS and for example only export C1 and C3.
-> everything is fine.
Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: Robert Schoene <robert.schoene@tu-dresden.de>
CC: Jean Pihet <j-pihet@ti.com>
CC: Arjan van de Ven <arjan@linux.intel.com>
CC: Ingo Molnar <mingo@elte.hu>
CC: Frederic Weisbecker <fweisbec@gmail.com>
CC: linux-pm@lists.linux-foundation.org
CC: linux-acpi@vger.kernel.org
CC: linux-kernel@vger.kernel.org
CC: linux-perf-users@vger.kernel.org
CC: linux-omap@vger.kernel.org
Signed-off-by: Len Brown <len.brown@intel.com>
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Intel_idle driver uses CLOCK_EVT_NOTIFY_BROADCAST_ENTER
CLOCK_EVT_NOTIFY_BROADCAST_EXIT
for broadcast clock events. The _ENTER/_EXIT doesn't really open broadcast clock
events, please see processor_idle.c for an example. In some situation, this will
cause boot hang, because some CPUs enters idle but local APIC timer stalls.
Reported-and-tested-by: Yan Zheng <zheng.z.yan@intel.com>
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
cc: stable@kernel.org
Signed-off-by: Len Brown <len.brown@intel.com>
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Signed-off-by: Len Brown <len.brown@intel.com>
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Having four variables for the same thing:
idle_halt, idle_nomwait, force_mwait and boot_option_idle_overrides
is rather confusing and unnecessary complex.
if idle= boot param is passed, only set up one variable:
boot_option_idle_overrides
Introduces following functional changes/fixes:
- intel_idle driver does not register if any idle=xy
boot param is passed.
- processor_idle.c will also not register a cpuidle driver
and get active if idle=halt is passed.
Before a cpuidle driver with one (C1, halt) state got registered
Now the default_idle function will be used which finally uses
the same idle call to enter sleep state (safe_halt()), but
without registering a whole cpuidle driver.
That means idle= param will always avoid cpuidle drivers to register
with one exception (same behavior as before):
idle=nomwait
may still register acpi_idle cpuidle driver, but C1 will not use
mwait, but hlt. This can be a workaround for IO based deeper sleep
states where C1 mwait causes problems.
Signed-off-by: Thomas Renninger <trenn@suse.de>
cc: x86@kernel.org
Signed-off-by: Len Brown <len.brown@intel.com>
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Signed-off-by: Len Brown <len.brown@intel.com>
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Add these new power trace events:
power:cpu_idle
power:cpu_frequency
power:machine_suspend
The old C-state/idle accounting events:
power:power_start
power:power_end
Have now a replacement (but we are still keeping the old
tracepoints for compatibility):
power:cpu_idle
and
power:power_frequency
is replaced with:
power:cpu_frequency
power:machine_suspend is newly introduced.
Jean Pihet has a patch integrated into the generic layer
(kernel/power/suspend.c) which will make use of it.
the type= field got removed from both, it was never
used and the type is differed by the event type itself.
perf timechart userspace tool gets adjusted in a separate patch.
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Jean Pihet <jean.pihet@newoldbits.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: rjw@sisk.pl
LKML-Reference: <1294073445-14812-3-git-send-email-trenn@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <1290072314-31155-2-git-send-email-trenn@suse.de>
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power_frequency moved to drivers/cpufreq/cpufreq.c which has
to be compiled in, no need to export it.
intel_idle can a be module though...
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Jean Pihet <jean.pihet@newoldbits.com>
Cc: Jean Pihet <j-pihet@ti.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: rjw@sisk.pl
LKML-Reference: <1294073445-14812-2-git-send-email-trenn@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <1290072314-31155-2-git-send-email-trenn@suse.de>
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We erroneously ignored the Always Running APIC Timer on WSM-EX.
Move the check for ARAT down so that it can apply to any/all models.
Signed-off-by: Len Brown <len.brown@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6
* 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6:
intel_idle: do not use the LAPIC timer for ATOM C2
intel_idle: add initial Sandy Bridge support
acpi_idle: delete bogus data from cpuidle_state.power_usage
intel_idle: delete bogus data from cpuidle_state.power_usage
intel_idle: simplify test for leave_mm()
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If we use the LAPIC timer during ATOM C2 on
some nvidia chisets, the system stalls.
https://bugzilla.kernel.org/show_bug.cgi?id=21032
Signed-off-by: Len Brown <len.brown@intel.com>
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Signed-off-by: Len Brown <len.brown@intel.com>
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Signed-off-by: Len Brown <len.brown@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-idle-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86, hotplug: In the MWAIT case of play_dead, CLFLUSH the cache line
x86, hotplug: Move WBINVD back outside the play_dead loop
x86, hotplug: Use mwait to offline a processor, fix the legacy case
x86, mwait: Move mwait constants to a common header file
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The mW data in this field is a total fabrication
and serves no purpose other than to mislead
those who might see it in sysfs. Delete it.
Signed-off-by: Len Brown <len.brown@intel.com>
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A run-time test to invoke leave_mm() for the deepest
supported C-state is redundant, since the appropriate
C-states already have flags with CPUIDLE_FLAG_TLB_FLUSHED set.
Signed-off-by: Len Brown <len.brown@intel.com>
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ATM-C6 was commented out, pending public documentation.
https://bugzilla.kernel.org/show_bug.cgi?id=19762
Tested-by: Dennis Jansen <Dennis.Jansen@...>
Signed-off-by: Len Brown <len.brown@intel.com>
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Avoid TLB flush IPIs for the cores in deeper c-states by voluntary leave_mm()
before entering into that state. CPUs tend to flush TLB in those c-states
anyways.
acpi_idle does this with C3-type states, but it was not caried over
when intel_idle was introduced. intel_idle can apply it
to C-states in addition to those that ACPI might export as C3...
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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intel_idle_cpuidle_devices is a percpu pointer
but was missing __percpu markup.
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Len Brown <len.brown@intel.com>
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Remove execution permission from source file.
Signed-off-by: Thomas Weber <weber@corscience.de>
Signed-off-by: Len Brown <len.brown@intel.com>
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We have MWAIT constants spread across three different .c files, for no
good reason. Move them all into a common header file.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Reviewed-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Len Brown <lenb@kernel.org>
LKML-Reference: <tip-*@git.kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6
* 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6:
intel_idle: recognize Lincroft Atom Processor
intel_idle: no longer EXPERIMENTAL
intel_idle: disable module support
intel_idle: add support for Westmere-EX
intel_idle: delete power_policy modparam, and choose substate functions
intel_idle: delete substates DEBUG modparam
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Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
[CPUFREQ] Remove pointless printk from p4-clockmod.
[CPUFREQ] Fix section mismatch for powernow_cpu_init in powernow-k7.c
[CPUFREQ] Fix section mismatch for longhaul_cpu_init.
[CPUFREQ] Fix section mismatch for longrun_cpu_init.
[CPUFREQ] powernow-k8: Fix misleading variable naming
[CPUFREQ] Convert pci_table entries to PCI_VDEVICE (if PCI_ANY_ID is used)
[CPUFREQ] arch/x86/kernel/cpu/cpufreq: use for_each_pci_dev()
[CPUFREQ] fix brace coding style issue.
[CPUFREQ] x86 cpufreq: Make trace_power_frequency cpufreq driver independent
[CPUFREQ] acpi-cpufreq: Fix CPU_ANY CPUFREQ_{PRE,POST}CHANGE notification
[CPUFREQ] ondemand: don't synchronize sample rate unless multiple cpus present
[CPUFREQ] unexport (un)lock_policy_rwsem* functions
[CPUFREQ] ondemand: Refactor frequency increase code
[CPUFREQ] powernow-k8: On load failure, remind the user to enable support in BIOS setup
[CPUFREQ] powernow-k8: Limit Pstate transition latency check
[CPUFREQ] Fix PCC driver error path
[CPUFREQ] fix double freeing in error path of pcc-cpufreq
[CPUFREQ] pcc driver should check for pcch method before calling _OSC
[CPUFREQ] fix memory leak in cpufreq_add_dev
[CPUFREQ] revert "[CPUFREQ] remove rwsem lock from CPUFREQ_GOV_STOP call (second call site)"
Manually fix up non-data merge conflict introduced by new calling
conventions for trace_power_start() in commit 6f4f2723d085 ("x86
cpufreq: Make trace_power_frequency cpufreq driver independent"), which
didn't update the intel_idle native hardware cpuidle driver.
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Signed-off-by: Len Brown <len.brown@intel.com>
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The idea behind power policy was that it would start off as a modparam,
and then hook into the new "global" in-kernel power vs energy tunable.
But that tunable isn't happening, so delete the hook here.
With the policy hook gone, the sub-state choice functions
do not do anything useful, so delete them from the critical path.
To handle sub-states in the future, we will advertise them
with dedicated cpuidle_state entries. That is necessary
because some of the sub-states will have substantially different
properties than their peer sub-states.
Signed-off-by: Len Brown <len.brown@intel.com>
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it isn't useful anymore
Signed-off-by: Len Brown <len.brown@intel.com>
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This EXPERIMENTAL driver supersedes acpi_idle on
Intel Atom Processors, Intel Core i3/i5/i7 Processors
and associated Intel Xeon processors.
It does not support the Intel Core2 processor or earlier.
For kernels configured with ACPI, CONFIG_INTEL_IDLE=y
allows intel_idle to probe before the ACPI processor driver.
Booting with "intel_idle.max_cstate=0" disables intel_idle
and the system will fall back on ACPI's "acpi_idle".
Typical Linux distributions load ACPI processor module early,
making CONFIG_INTEL_IDLE=m not easily useful on ACPI platforms.
intel_idle probes all processors at module_init time.
Processors that are hot-added later will be limited
to using C1 in idle.
Signed-off-by: Len Brown <len.brown@intel.com>
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