20 Jun, 2017
1 commit
-
Conflicts:
kernel/sched/MakefilePick up the waitqueue related renames - it didn't get much feedback,
so it appears to be uncontroversial. Famous last words? ;-)Signed-off-by: Ingo Molnar
15 Jun, 2017
1 commit
-
* pm-cpufreq:
cpufreq: conservative: Allow down_threshold to take values from 1 to 10
Revert "cpufreq: schedutil: Reduce frequencies slower"* pm-cpuidle:
cpuidle: dt: Add missing 'of_node_put()'* pm-devfreq:
PM / devfreq: exynos-ppmu: Staticize event list
PM / devfreq: exynos-ppmu: Handle return value of clk_prepare_enable
PM / devfreq: exynos-nocp: Handle return value of clk_prepare_enable
12 Jun, 2017
1 commit
-
'of_node_put()' should be called on pointer returned by
'of_parse_phandle()' when done. In this function this is done in all path
except this 'continue', so add it.Fixes: 97735da074fd (drivers: cpuidle: Add status property to ARM idle states)
Signed-off-by: Christophe Jaillet
Signed-off-by: Rafael J. Wysocki
15 May, 2017
1 commit
-
Ville reported that on his Core2, which has TSC stop in idle, we would
always report very short idle durations. He tracked this down to
commit:e93e59ce5b85 ("cpuidle: Replace ktime_get() with local_clock()")
which replaces ktime_get() with local_clock().
Add a sched_clock_idle_wakeup_event() call, which will re-sync the
clock with ktime_get_ns() when TSC is unstable and no-op otherwise.Reported-by: Ville Syrjälä
Tested-by: Ville Syrjälä
Signed-off-by: Peter Zijlstra (Intel)
Cc: Daniel Lezcano
Cc: Linus Torvalds
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Rafael J . Wysocki
Cc: Thomas Gleixner
Cc: linux-kernel@vger.kernel.org
Fixes: e93e59ce5b85 ("cpuidle: Replace ktime_get() with local_clock()")
Signed-off-by: Ingo Molnar
10 May, 2017
1 commit
-
* pm-domains:
PM / Domains: Add DT file to MAINTAINERS
PM / Domains: Fix DT example* pm-cpuidle:
x86/intel_idle: add Gemini Lake support
cpuidle: check dev before usage in cpuidle_use_deepest_state()* pm-sleep:
ACPI / sleep: Ignore spurious SCI wakeups from suspend-to-idle
PM / wakeup: Integrate mechanism to abort transitions in progress* powercap:
powercap: intel_rapl: Add support for Gemini Lake
02 May, 2017
1 commit
-
In case of there is no cpuidle devices registered, dev will be null, and
panic will be triggered like below;
In this patch, add checking of dev before usage, like that done in
cpuidle_idle_call.Panic without fix:
[ 184.961328] BUG: unable to handle kernel NULL pointer dereference at
(null)
[ 184.961328] IP: cpuidle_use_deepest_state+0x30/0x60
...
[ 184.961328] play_idle+0x8d/0x210
[ 184.961328] ? __schedule+0x359/0x8e0
[ 184.961328] ? _raw_spin_unlock_irqrestore+0x28/0x50
[ 184.961328] ? kthread_queue_delayed_work+0x41/0x80
[ 184.961328] clamp_idle_injection_func+0x64/0x1e0Fixes: bb8313b603eb8 (cpuidle: Allow enforcing deepest idle state selection)
Signed-off-by: Li, Fei
Tested-by: Shi, Feng
Reviewed-by: Andy Shevchenko
Cc: 4.10+ # 4.10+
Signed-off-by: Rafael J. Wysocki
29 Apr, 2017
1 commit
-
* pm-cpuidle:
cpuidle: powernv: Avoid a branch in the core snooze_loop() loop
cpuidle: powernv: Don't continually set thread priority in snooze_loop()
cpuidle: powernv: Don't bounce between low and very low thread priority
cpuidle: cpuidle-cps: remove unused variable
powernv-cpuidle: Validate DT property array size* pm-core:
PM / runtime: Document autosuspend-helper side effects
PM / runtime: Fix autosuspend documentation* pm-domains:
PM / Domains: Ignore domain-idle-states that are not compatible
PM / Domains: Don't warn about IRQ safe device for an always on PM domain
PM / Domains: Respect errors from genpd's ->power_off() callback
PM / Domains: Enable users of genpd to specify always on PM domains
PM / Domains: Clean up code validating genpd's status
PM / Domain: remove conditional from error case* pm-avs:
PM / AVS: rockchip-io: add io selectors and supplies for rk3328* pm-devfreq:
PM / devfreq: Move struct devfreq_governor to devfreq directory
20 Apr, 2017
4 commits
-
When in the snooze_loop() we want to take up the least amount of
resources. On my version of gcc (6.3), we end up with an extra
branch because it predicts snooze_timeout_en to be false, whereas it
is almost always true.Use likely() to avoid the branch and be a little nicer to the
other non idle threads on the core.Signed-off-by: Anton Blanchard
Reviewed-by: Vaidyanathan Srinivasan
Signed-off-by: Rafael J. Wysocki -
The powerpc64 kernel exception handlers have preserved thread priorities
for a long time now, so there is no need to continually set it.Just set it once on entry and once exit.
Signed-off-by: Anton Blanchard
Reviewed-by: Vaidyanathan Srinivasan
Signed-off-by: Rafael J. Wysocki -
The core of snooze_loop() continually bounces between low and very
low thread priority. Changing thread priorities is an expensive
operation that can negatively impact other threads on a core.All CPUs that can run PowerNV support very low priority, so we can
avoid the change completely.Signed-off-by: Anton Blanchard
Reviewed-by: Vaidyanathan Srinivasan
Signed-off-by: Rafael J. Wysocki -
'core' in cps_cpuidle_init has never been used and is unnecessary, so
remove the dead code.Signed-off-by: Marcin Nowakowski
Signed-off-by: Rafael J. Wysocki
30 Mar, 2017
1 commit
-
drv->cpumask defaults to cpu_possible_mask in __cpuidle_driver_init().
On PowerNV platform cpu_present could be less than cpu_possible in cases
where firmware detects the cpu, but it is not available to the OS. When
CONFIG_HOTPLUG_CPU=n, such cpus are not hotplugable at runtime and hence
we skip creating cpu_device.This breaks cpuidle on powernv where register_cpu() is not called for
cpus in cpu_possible_mask that cannot be hot-added at runtime.Trying cpuidle_register_device() on cpu without cpu_device will cause
crash like this:cpu 0xf: Vector: 380 (Data SLB Access) at [c000000ff1503490]
pc: c00000000022c8bc: string+0x34/0x60
lr: c00000000022ed78: vsnprintf+0x284/0x42c
sp: c000000ff1503710
msr: 9000000000009033
dar: 6000000060000000
current = 0xc000000ff1480000
paca = 0xc00000000fe82d00 softe: 0 irq_happened: 0x01
pid = 1, comm = swapper/8
Linux version 4.11.0-rc2 (sv@sagarika) (gcc version 4.9.4
(Buildroot 2017.02-00004-gc28573e) ) #15 SMP Fri Mar 17 19:32:02 IST 2017
enter ? for help
[link register ] c00000000022ed78 vsnprintf+0x284/0x42c
[c000000ff1503710] c00000000022ebb8 vsnprintf+0xc4/0x42c (unreliable)
[c000000ff1503800] c00000000022ef40 vscnprintf+0x20/0x44
[c000000ff1503830] c0000000000ab61c vprintk_emit+0x94/0x2cc
[c000000ff15038a0] c0000000000acc9c vprintk_func+0x60/0x74
[c000000ff15038c0] c000000000619694 printk+0x38/0x4c
[c000000ff15038e0] c000000000224950 kobject_get+0x40/0x60
[c000000ff1503950] c00000000022507c kobject_add_internal+0x60/0x2c4
[c000000ff15039e0] c000000000225350 kobject_init_and_add+0x70/0x78
[c000000ff1503a60] c00000000053c288 cpuidle_add_sysfs+0x9c/0xe0
[c000000ff1503ae0] c00000000053aeac cpuidle_register_device+0xd4/0x12c
[c000000ff1503b30] c00000000053b108 cpuidle_register+0x98/0xcc
[c000000ff1503bc0] c00000000085eaf0 powernv_processor_idle_init+0x140/0x1e0
[c000000ff1503c60] c00000000000cd60 do_one_initcall+0xc0/0x15c
[c000000ff1503d20] c000000000833e84 kernel_init_freeable+0x1a0/0x25c
[c000000ff1503dc0] c00000000000d478 kernel_init+0x24/0x12c
[c000000ff1503e30] c00000000000b564 ret_from_kernel_thread+0x5c/0x78This patch fixes the bug by passing correct cpumask from
powernv-cpuidle driver.Signed-off-by: Vaidyanathan Srinivasan
Reviewed-by: Gautham R. Shenoy
Acked-by: Michael Ellerman
[ rjw: Comment massage ]
Signed-off-by: Rafael J. Wysocki
29 Mar, 2017
1 commit
-
The various properties associated with powernv idle states such as
names, flags, residency-ns, latencies-ns, psscr, psscr-mask are
exposed in the device-tree as property arrays such the pointwise
entries in each of these arrays correspond to the properties of the
same idle state.This patch validates that the lengths of the property arrays are the
same. If there is a mismatch, the patch will ensure that we bail out
and not expose the platform idle states via cpuidle.Signed-off-by: Gautham R. Shenoy
Reviewed-by: Shilpasri G Bhat
Signed-off-by: Rafael J. Wysocki
22 Mar, 2017
1 commit
-
If a given cpu is not in cpu_present and cpu hotplug
is disabled, arch can skip setting up the cpu_dev.Arch cpuidle driver should pass correct cpu mask
for registration, but failing to do so by the driver
causes error to propagate and crash like this:[ 30.076045] Unable to handle kernel paging request for data at address 0x00000048
[ 30.076100] Faulting instruction address: 0xc0000000007b2f30
cpu 0x4d: Vector: 300 (Data Access) at [c000003feb18b670]
pc: c0000000007b2f30: kobject_get+0x20/0x70
lr: c0000000007b3c94: kobject_add_internal+0x54/0x3f0
sp: c000003feb18b8f0
msr: 9000000000009033
dar: 48
dsisr: 40000000
current = 0xc000003fd2ed8300
paca = 0xc00000000fbab500 softe: 0 irq_happened: 0x01
pid = 1, comm = swapper/0
Linux version 4.11.0-rc2-svaidy+ (sv@sagarika) (gcc version 6.2.0
20161005 (Ubuntu 6.2.0-5ubuntu12) ) #10 SMP Sun Mar 19 00:08:09 IST 2017
enter ? for help
[c000003feb18b960] c0000000007b3c94 kobject_add_internal+0x54/0x3f0
[c000003feb18b9f0] c0000000007b43a4 kobject_init_and_add+0x64/0xa0
[c000003feb18ba70] c000000000e284f4 cpuidle_add_sysfs+0xb4/0x130
[c000003feb18baf0] c000000000e26038 cpuidle_register_device+0x118/0x1c0
[c000003feb18bb30] c000000000e26c48 cpuidle_register+0x78/0x120
[c000003feb18bbc0] c00000000168fd9c powernv_processor_idle_init+0x110/0x1c4
[c000003feb18bc40] c00000000000cff8 do_one_initcall+0x68/0x1d0
[c000003feb18bd00] c0000000016242f4 kernel_init_freeable+0x280/0x360
[c000003feb18bdc0] c00000000000d864 kernel_init+0x24/0x160
[c000003feb18be30] c00000000000b4e8 ret_from_kernel_thread+0x5c/0x74Validating cpu_dev fixes the crash and reports correct error message like:
[ 30.163506] Failed to register cpuidle device for cpu136
[ 30.173329] Registration of powernv driver failed.Signed-off-by: Vaidyanathan Srinivasan
[ rjw: Comment massage ]
Signed-off-by: Rafael J. Wysocki
04 Mar, 2017
1 commit
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Pull sched.h split-up from Ingo Molnar:
"The point of these changes is to significantly reduce the
header footprint, to speed up the kernel build and to
have a cleaner header structure.After these changes the new 's typical preprocessed
size goes down from a previous ~0.68 MB (~22K lines) to ~0.45 MB (~15K
lines), which is around 40% faster to build on typical configs.Not much changed from the last version (-v2) posted three weeks ago: I
eliminated quirks, backmerged fixes plus I rebased it to an upstream
SHA1 from yesterday that includes most changes queued up in -next plus
all sched.h changes that were pending from Andrew.I've re-tested the series both on x86 and on cross-arch defconfigs,
and did a bisectability test at a number of random points.I tried to test as many build configurations as possible, but some
build breakage is probably still left - but it should be mostly
limited to architectures that have no cross-compiler binaries
available on kernel.org, and non-default configurations"* 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (146 commits)
sched/headers: Clean up
sched/headers: Remove #ifdefs from
sched/headers: Remove the include from
sched/headers, hrtimer: Remove the include from
sched/headers, x86/apic: Remove the header inclusion from
sched/headers, timers: Remove the include from
sched/headers: Remove from
sched/headers: Remove from
sched/core: Remove unused prefetch_stack()
sched/headers: Remove from
sched/headers: Remove the 'init_pid_ns' prototype from
sched/headers: Remove from
sched/headers: Remove from
sched/headers: Remove the runqueue_is_locked() prototype
sched/headers: Remove from
sched/headers: Remove from
sched/headers: Remove from
sched/headers: Remove from
sched/headers: Remove the include from
sched/headers: Remove from
...
03 Mar, 2017
1 commit
-
Pull more power management updates deom Rafael Wysocki:
"These fix two bugs introduced by recent power management updates (in
the cpuidle menu governor and intel_pstate) and a few other issues,
clean up things and remove unused code.Specifics:
- Fix for a cpuidle menu governor problem that started to take an
unnecessary spinlock after one of the recent updates and that did
not play well with the RT patch (Rafael Wysocki).- Fix for the new intel_pstate operation mode switching feature added
recently that did not reinitialize P-state limits properly when
switching operation modes (Rafael Wysocki).- Removal of unused global notifiers from the PM QoS framework
(Viresh Kumar).- Generic power domains framework update to make it handle
asynchronous invocations of PM callbacks in the "noirq" phases of
system suspend/hibernation correctly (Ulf Hansson).- Two hibernation core cleanups (Rafael Wysocki).
- intel_idle cleanup related to the sysfs interface (Len Brown).
- Off-by-one bug fix in the OPP (Operating Performance Points)
framework (Andrzej Hajda).- OPP framework's documentation fix (Viresh Kumar).
- cpufreq qoriq driver cleanup (Tang Yuantian).
- Fixes for typos in comments in the device runtime PM framework
(Christophe Jaillet)"* tag 'pm-extra-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
PM / OPP: Documentation: Fix opp-microvolt in examples
intel_idle: stop exposing platform acronyms in sysfs
cpufreq: intel_pstate: Fix limits issue with operation mode switching
PM / hibernate: Define pr_fmt() and use pr_*() instead of printk()
PM / hibernate: Untangle power_down()
cpuidle: menu: Avoid taking spinlock for accessing QoS values
PM / QoS: Remove global notifiers
PM / runtime: Fix some typos
cpufreq: qoriq: clean up unused code
PM / OPP: fix off-by-one bug in dev_pm_opp_get_max_volt_latency loop
PM / Domains: Power off masters immediately in the power off sequence
PM / Domains: Rename is_async to one_dev_on for genpd_power_off()
PM / Domains: Move genpd_power_off() above genpd_power_on()
02 Mar, 2017
4 commits
-
We are going to split out of , which
will have to be picked up from other headers and a couple of .c files.Create a trivial placeholder file that just
maps to to make this patch obviously correct and
bisectable.Include the new header in the files that are going to need it.
Acked-by: Linus Torvalds
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar -
We are going to split out of , which
will have to be picked up from a couple of .c files.Create a trivial placeholder file that just
maps to to make this patch obviously correct and
bisectable.Include the new header in the files that are going to need it.
Acked-by: Linus Torvalds
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar -
We are going to split out of , which
will have to be picked up from other headers and .c files.Create a trivial placeholder file that just
maps to to make this patch obviously correct and
bisectable.Include the new header in the files that are going to need it.
Acked-by: Linus Torvalds
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar -
We are going to split out of , which
will have to be picked up from other headers and a couple of .c files.Create a trivial placeholder file that just
maps to to make this patch obviously correct and
bisectable.Include the new header in the files that are going to need it.
Acked-by: Linus Torvalds
Cc: Mike Galbraith
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar
27 Feb, 2017
1 commit
-
After commit 9908859acaa9 (cpuidle/menu: add per CPU PM QoS resume
latency consideration) the cpuidle menu governor calls
dev_pm_qos_read_value() on CPU devices to read the current resume
latency QoS constraint values for them. That function takes a spinlock
to prevent the device's power.qos pointer from becoming NULL during
the access which is a problem for the RT patchset where spinlocks are
converted into mutexes and the idle loop stops working.However, it is not even necessary for the menu governor to take
that spinlock, because the power.qos pointer accessed under it
cannot be modified during the access anyway.For this reason, introduce a "raw" routine for accessing device
QoS resume latency constraints without locking and use it in the
menu governor.Fixes: 9908859acaa9 (cpuidle/menu: add per CPU PM QoS resume latency consideration)
Acked-by: Alex Shi
Signed-off-by: Rafael J. Wysocki
23 Feb, 2017
1 commit
-
Pull powerpc updates from Michael Ellerman:
"Highlights include:- Support for direct mapped LPC on POWER9, giving Linux direct access
to devices that may be on there such as a UART.- Memory hotplug support for the Power9 Radix MMU.
- Add new AUX vectors describing the processor's cache geometry, to
be used by glibc.- The ability for a guest to ask the hypervisor to resize the guest's
hash table, and in addition support for doing so automatically when
memory is hotplugged into/out-of the guest. This allows the hash
table to be sized based on the current memory usage of the guest,
rather than the maximum possible memory usage.- Implementation of optprobes (kprobe optimisation) for powerpc.
In addition there's the topic branch shared with the KVM tree, which
includes support for guests to use the Radix MMU on Power9.Thanks to:
Alistair Popple, Andrew Donnellan, Aneesh Kumar K.V, Anju T, Anton
Blanchard, Benjamin Herrenschmidt, Chris Packham, Daniel Axtens,
Daniel Borkmann, David Gibson, Finn Thain, Gautham R. Shenoy, Gavin
Shan, Greg Kurz, Joel Stanley, John Allen, Madhavan Srinivasan,
Mahesh Salgaonkar, Markus Elfring, Michael Neuling, Nathan Fontenot,
Naveen N. Rao, Nicholas Piggin, Paul Mackerras, Ravi Bangoria, Reza
Arbab, Shailendra Singh, Vaibhav Jain, Wei Yongjun"* tag 'powerpc-4.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (129 commits)
powerpc/mm/radix: Skip ptesync in pte update helpers
powerpc/mm/radix: Use ptep_get_and_clear_full when clearing pte for full mm
powerpc/mm/radix: Update pte update sequence for pte clear case
powerpc/mm: Update PROTFAULT handling in the page fault path
powerpc/xmon: Fix data-breakpoint
powerpc/mm: Fix build break with BOOK3S_64=n and MEMORY_HOTPLUG=y
powerpc/mm: Fix build break when CMA=n && SPAPR_TCE_IOMMU=y
powerpc/mm: Fix build break with RADIX=y & HUGETLBFS=n
powerpc/pseries: Fix typo in parameter description
powerpc/kprobes: Remove kprobe_exceptions_notify()
kprobes: Introduce weak variant of kprobe_exceptions_notify()
powerpc/ftrace: Fix confusing help text for DISABLE_MPROFILE_KERNEL
powerpc/powernv: Fix opal_exit tracepoint opcode
powerpc: Add a prototype for mcount() so it can be versioned
powerpc: Drop GPL from of_node_to_nid() export to match other arches
powerpc/kprobes: Optimize kprobe in kretprobe_trampoline()
powerpc/kprobes: Implement Optprobes
powerpc/kprobes: Fixes for kprobe_lookup_name() on BE
powerpc: Add helper to check if offset is within relative branch range
powerpc/bpf: Introduce __PPC_SH64()
...
31 Jan, 2017
2 commits
-
The power9_idle_stop method currently takes only the requested stop
level as a parameter and picks up the rest of the PSSCR bits from a
hand-coded macro. This is not a very flexible design, especially when
the firmware has the capability to communicate the psscr value and the
mask associated with a particular stop state via device tree.This patch modifies the power9_idle_stop API to take as parameters the
PSSCR value and the PSSCR mask corresponding to the stop state that
needs to be set. These PSSCR value and mask are respectively obtained
by parsing the "ibm,cpu-idle-state-psscr" and
"ibm,cpu-idle-state-psscr-mask" fields from the device tree.In addition to this, the patch adds support for handling stop states
for which ESL and EC bits in the PSSCR are zero. As per the
architecture, a wakeup from these stop states resumes execution from
the subsequent instruction as opposed to waking up at the System
Vector.The older firmware sets only the Requested Level (RL) field in the
psscr and psscr-mask exposed in the device tree. For older firmware
where psscr-mask=0xf, this patch will set the default sane values that
the set for for remaining PSSCR fields (i.e PSLL, MTL, ESL, EC, and
TR). For the new firmware, the patch will validate that the invariants
required by the ISA for the psscr values are maintained by the
firmware.This skiboot patch that exports fully populated PSSCR values and the
mask for all the stop states can be found here:
https://lists.ozlabs.org/pipermail/skiboot/2016-September/004869.html[Optimize the number of instructions before entering STOP with
ESL=EC=0, validate the PSSCR values provided by the firimware
maintains the invariants required as per the ISA suggested by Balbir
Singh]Acked-by: Balbir Singh
Signed-off-by: Gautham R. Shenoy
Signed-off-by: Michael Ellerman -
In the current code for powernv_add_idle_states, there is a lot of code
duplication while initializing an idle state in powernv_states table.Add an inline helper function to populate the powernv_states[] table
for a given idle state. Invoke this for populating the "Nap",
"Fastsleep" and the stop states in powernv_add_idle_states.Signed-off-by: Gautham R. Shenoy
Acked-by: Balbir Singh
Acked-by: Rafael J. Wysocki
Signed-off-by: Michael Ellerman
30 Jan, 2017
2 commits
-
There may be special requirements on CPU response time, like if a
interrupt is pinned to a CPU, that CPU should not go into excessively
deep idle states. For this reason, add a mechanism for adding
PM QoS resume latency constraints for individual CPUs and modify the
menu governor to take them into account.To that end, extend the device PM QoS pm_qos_resume_latency attribute
to CPUs, which is possible, because the exit latency for CPUs is
effectively equivalent to the resume latency for devices.Signed-off-by: Alex Shi
Acked-by: Rik van Riel
[ rjw : Subject & changelog ]
Signed-off-by: Rafael J. Wysocki -
Obsolete commit 71abbbf856a0 (cpuidle: extend cpuidle and menu governor
to handle dynamic states) wanted to introduce dynamic C-states, but that
idea was dropped long ago. The nonsense deeper C-state checking
remained, though.Since both target_residency and exit_latency are longer for deeper
idle state, there's no need to waste CPU time on useless checks.Signed-off-by: Alex Shi
Acked-by: Rik van Riel
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki
25 Dec, 2016
1 commit
-
This was entirely automated, using the script by Al:
PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*'
sed -i -e "s!$PATT!#include !" \
$(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h)to do the replacement at the end of the merge window.
Requested-by: Al Viro
Signed-off-by: Linus Torvalds
06 Dec, 2016
2 commits
-
Since cpuidle_use_deepest_state() is not static, add a proper
kerneldoc comment to it to document its purpose.Signed-off-by: Rafael J. Wysocki
-
In function cpuidle_add_state_sysfs(), variable ret takes the return
value. Its value should be negative on errors. Because ret is reset in
the loop, its value will be 0 during the second and after repeat of the
loop. If kzalloc() returns a NULL pointer then, it will return 0. It may
be better to explicitly assign "-ENOMEM" when the call to kzalloc()
fails.Link: https://bugzilla.kernel.org/show_bug.cgi?id=188901
Signed-off-by: Pan Bian
Signed-off-by: Rafael J. Wysocki
29 Nov, 2016
1 commit
-
When idle injection is used to cap power, we need to override the
governor's choice of idle states.For this reason, make it possible the deepest idle state selection to
be enforced by setting a flag on a given CPU to achieve the maximum
potential power draw reduction.Signed-off-by: Jacob Pan
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki
25 Nov, 2016
1 commit
-
powernv_idle_driver isn't exported, it can be made static. Found by sparse.
Signed-off-by: Andrew Donnellan
Signed-off-by: Rafael J. Wysocki
23 Nov, 2016
1 commit
-
enter_freeze() callback is expected atleast to do the same as enter()
but it has to guarantee that interrupts aren't enabled at any point
in its execution, as the tick is frozen.CPUs execute ->enter_freeze with the local tick or entire timekeeping
suspended, so it must not re-enable interrupts at any point (even
temporarily) or attempt to change states of clock event devices.It will be called when the system goes to suspend-to-idle and will
reduce power usage because CPUs won't be awaken for unnecessary IRQs
(i.e. woken up only on IRQs from "wakeup sources")We can reuse the same code for both the enter() and enter_freeze()
callbacks as along as they don't re-enable interrupts. Only "coupled"
cpuidle mechanism enables interrupts and doing that with timekeeping
suspended is generally not safe.Since this generic DT based idle driver doesn't support "coupled"
states, it is safe to assume that the interrupts are not re-enabled.This patch assign enter_freeze to same as enter callback function which
helps to save power without any intermittent spurious wakeups from
suspend-to-idle.Signed-off-by: Sudeep Holla
Tested-by: Andy Gross
Signed-off-by: Rafael J. Wysocki
21 Oct, 2016
1 commit
-
The governor's code use try_module_get() and put_module() to refcount
the governor's module. But the governors are not compiled as module.The refcount does not prevent to switch the governor or unload
a module as they aren't compiled as modules. The code is pointless,
so remove it.Signed-off-by: Daniel Lezcano
Signed-off-by: Rafael J. Wysocki
16 Oct, 2016
1 commit
-
Pull MIPS updates from Ralf Baechle:
"This is the main MIPS pull request for 4.9:MIPS core arch code:
- traps: 64bit kernels should read CP0_EBase 64bit
- traps: Convert ebase to KSEG0
- c-r4k: Drop bc_wback_inv() from icache flush
- c-r4k: Split user/kernel flush_icache_range()
- cacheflush: Use __flush_icache_user_range()
- uprobes: Flush icache via kernel address
- KVM: Use __local_flush_icache_user_range()
- c-r4k: Fix flush_icache_range() for EVA
- Fix -mabi=64 build of vdso.lds
- VDSO: Drop duplicated -I*/-E* aflags
- tracing: move insn_has_delay_slot to a shared header
- tracing: disable uprobe/kprobe on compact branch instructions
- ptrace: Fix regs_return_value for kernel context
- Squash lines for simple wrapper functions
- Move identification of VP(E) into proc.c from smp-mt.c
- Add definitions of SYNC barrierstype values
- traps: Ensure full EBase is written
- tlb-r4k: If there are wired entries, don't use TLBINVF
- Sanitise coherentio semantics
- dma-default: Don't check hw_coherentio if device is non-coherent
- Support per-device DMA coherence
- Adjust MIPS64 CAC_BASE to reflect Config.K0
- Support generating Flattened Image Trees (.itb)
- generic: Introduce generic DT-based board support
- generic: Convert SEAD-3 to a generic board
- Enable hardened usercopy
- Don't specify STACKPROTECTOR in defconfigsOcteon:
- Delete dead code and files across the platform.
- Change to use all memory into use by default.
- Rename upper case variables in setup code to lowercase.
- Delete legacy hack for broken bootloaders.
- Leave maintaining the link state to the actual ethernet/PHY drivers.
- Add DTS for D-Link DSR-500N.
- Fix PCI interrupt routing on D-Link DSR-500N.Pistachio:
- Remove ANDROID_TIMED_OUTPUT from defconfigTX39xx:
- Move GPIO setup from .mem_setup() to .arch_init()
- Convert to Common Clock FrameworkTX49xx:
- Move GPIO setup from .mem_setup() to .arch_init()
- Convert to Common Clock Frameworktxx9wdt:
- Add missing clock (un)prepare calls for CCFBMIPS:
- Add PW, GPIO SDHCI and NAND device node names
- Support APPENDED_DTB
- Add missing bcm97435svmb to DT_NONE
- Rename bcm96358nb4ser to bcm6358-neufbox4-sercom
- Add DT examples for BCM63268, BCM3368 and BCM6362
- Add support for BCM3368 and BCM6362PCI
- Reduce stack frame usage
- Use struct list_head lists
- Support for CONFIG_PCI_DOMAINS_GENERIC
- Make pcibios_set_cache_line_size an initcall
- Inline pcibios_assign_all_busses
- Split pci.c into pci.c & pci-legacy.c
- Introduce CONFIG_PCI_DRIVERS_LEGACY
- Support generic driversCPC
- Convert bare 'unsigned' to 'unsigned int'
- Avoid lock when MIPS CM >= 3 is presentGIC:
- Delete unused file smp-gic.cmt7620:
- Delete unnecessary assignment for the field "owner" from PCIBCM63xx:
- Let clk_disable() return immediately if clk is NULLpm-cps:
- Change FSB workaround to CPU blacklist
- Update comments on barrier instructions
- Use MIPS standard lightweight ordering barrier
- Use MIPS standard completion barrier
- Remove selection of sync types
- Add MIPSr6 CPU support
- Support CM3 changes to Coherence Enable RegisterSMP:
- Wrap call to mips_cpc_lock_other in mips_cm_lock_other
- Introduce mechanism for freeing and allocating IPIscpuidle:
- cpuidle-cps: Enable use with MIPSr6 CPUs.SEAD3:
- Rewrite to use DT and generic kernel feature.USB:
- host: ehci-sead3: Remove SEAD-3 EHCI codeFBDEV:
- cobalt_lcdfb: Drop SEAD3 supportdt-bindings:
- Document a binding for simple ASCII LCDsauxdisplay:
- img-ascii-lcd: driver for simple ASCII LCD displaysirqchip i8259:
- i8259: Add domain before mapping parent irq
- i8259: Allow platforms to override poll function
- i8259: Remove unused i8259A_irq_pendingMalta:
- Rewrite to use DTof/platform:
- Probe "isa" busses by defaultCM:
- Print CM error reports upon bus errorsModule:
- Migrate exception table users off module.h and onto extable.h
- Make various drivers explicitly non-modular:
- Audit and remove any unnecessary uses of module.hmailmap:
- Canonicalize to Qais' current email address.Documentation:
- MIPS supports HAVE_REGS_AND_STACK_ACCESS_APILoongson1C:
- Add CPU support for Loongson1C
- Add board support
- Add defconfig
- Add RTC support for Loongson1C boardAll this except one Documentation fix has sat in linux-next and has
survived Imagination's automated build test system"* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (127 commits)
Documentation: MIPS supports HAVE_REGS_AND_STACK_ACCESS_API
MIPS: ptrace: Fix regs_return_value for kernel context
MIPS: VDSO: Drop duplicated -I*/-E* aflags
MIPS: Fix -mabi=64 build of vdso.lds
MIPS: Enable hardened usercopy
MIPS: generic: Convert SEAD-3 to a generic board
MIPS: generic: Introduce generic DT-based board support
MIPS: Support generating Flattened Image Trees (.itb)
MIPS: Adjust MIPS64 CAC_BASE to reflect Config.K0
MIPS: Print CM error reports upon bus errors
MIPS: Support per-device DMA coherence
MIPS: dma-default: Don't check hw_coherentio if device is non-coherent
MIPS: Sanitise coherentio semantics
MIPS: PCI: Support generic drivers
MIPS: PCI: Introduce CONFIG_PCI_DRIVERS_LEGACY
MIPS: PCI: Split pci.c into pci.c & pci-legacy.c
MIPS: PCI: Inline pcibios_assign_all_busses
MIPS: PCI: Make pcibios_set_cache_line_size an initcall
MIPS: PCI: Support for CONFIG_PCI_DOMAINS_GENERIC
MIPS: PCI: Use struct list_head lists
...
08 Oct, 2016
1 commit
-
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
Acked-by: Peter Zijlstra (Intel)
Tested-by: Peter Zijlstra (Intel)
Tested-by: Daniel Thompson [arm]
Tested-by: Petr Mladek
Cc: Aaron Tomlin
Cc: Peter Zijlstra (Intel)
Cc: "Rafael J. Wysocki"
Cc: Russell King
Cc: Thomas Gleixner
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
04 Oct, 2016
2 commits
-
This patch enables the MIPS CPS driver for MIPSr6 CPUs.
Signed-off-by: Matt Redfearn
Reviewed-by: Paul Burton
Reviewed-by: Daniel Lezcano
Cc: Rafael J. Wysocki
Cc: linux-mips@linux-mips.org
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14228/
Signed-off-by: Ralf Baechle -
Pull CPU hotplug updates from Thomas Gleixner:
"Yet another batch of cpu hotplug core updates and conversions:- Provide core infrastructure for multi instance drivers so the
drivers do not have to keep custom lists.- Convert custom lists to the new infrastructure. The block-mq custom
list conversion comes through the block tree and makes the diffstat
tip over to more lines removed than added.- Handle unbalanced hotplug enable/disable calls more gracefully.
- Remove the obsolete CPU_STARTING/DYING notifier support.
- Convert another batch of notifier users.
The relayfs changes which conflicted with the conversion have been
shipped to me by Andrew.The remaining lot is targeted for 4.10 so that we finally can remove
the rest of the notifiers"* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (46 commits)
cpufreq: Fix up conversion to hotplug state machine
blk/mq: Reserve hotplug states for block multiqueue
x86/apic/uv: Convert to hotplug state machine
s390/mm/pfault: Convert to hotplug state machine
mips/loongson/smp: Convert to hotplug state machine
mips/octeon/smp: Convert to hotplug state machine
fault-injection/cpu: Convert to hotplug state machine
padata: Convert to hotplug state machine
cpufreq: Convert to hotplug state machine
ACPI/processor: Convert to hotplug state machine
virtio scsi: Convert to hotplug state machine
oprofile/timer: Convert to hotplug state machine
block/softirq: Convert to hotplug state machine
lib/irq_poll: Convert to hotplug state machine
x86/microcode: Convert to hotplug state machine
sh/SH-X3 SMP: Convert to hotplug state machine
ia64/mca: Convert to hotplug state machine
ARM/OMAP/wakeupgen: Convert to hotplug state machine
ARM/shmobile: Convert to hotplug state machine
arm64/FP/SIMD: Convert to hotplug state machine
...
02 Oct, 2016
1 commit
-
* pm-cpuidle:
ARM: cpuidle: Fix error return code* pm-opp:
PM / OPP: Don't support OPP if it provides supported-hw but platform does not
PM / OPP: avoid maybe-uninitialized warning* pm-avs:
PM / AVS: SmartReflex: Neaten logging
07 Sep, 2016
2 commits
-
Install the callbacks via the state machine.
Signed-off-by: Sebastian Andrzej Siewior
Cc: linux-pm@vger.kernel.org
Cc: Peter Zijlstra
Cc: Daniel Lezcano
Cc: "Rafael J. Wysocki"
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160824091444.brdr5zpbxjvh6n3f@linutronix.de
Signed-off-by: Thomas Gleixner -
Install the callbacks via the state machine.
v1…v2: - Use only CPUHP_CPUIDLE_DEAD (requested by Daniel Lezcano)
Signed-off-by: Sebastian Andrzej Siewior
Cc: linux-pm@vger.kernel.org
Cc: Peter Zijlstra
Cc: Daniel Lezcano
Cc: "Rafael J. Wysocki"
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160824091259.ozyslcopxvbfdqzy@linutronix.de
Signed-off-by: Thomas Gleixner
