After commit e3728b50cd ("ACPI: PM: s2idle: Avoid possible race
related to the EC GPE") wakeup interrupts occurring immediately after
the one discarded by acpi_s2idle_wake() may be missed. Moreover, if
the SCI triggers again immediately after the rearming in
acpi_s2idle_wake(), that wakeup may be missed too.
The problem is that pm_system_irq_wakeup() only calls pm_system_wakeup()
when pm_wakeup_irq is 0, but that's not the case any more after the
interrupt causing acpi_s2idle_wake() to run until pm_wakeup_irq is
cleared by the pm_wakeup_clear() call in s2idle_loop(). However,
there may be wakeup interrupts occurring in that time frame and if
that happens, they will be missed.
To address that issue first move the clearing of pm_wakeup_irq to
the point at which it is known that the interrupt causing
acpi_s2idle_wake() to tun will be discarded, before rearming the SCI
for wakeup. Moreover, because that only reduces the size of the
time window in which the issue may manifest itself, allow
pm_system_irq_wakeup() to register two second wakeup interrupts in
a row and, when discarding the first one, replace it with the second
one. [Of course, this assumes that only one wakeup interrupt can be
discarded in one go, but currently that is the case and I am not
aware of any plans to change that.]
Fixes: e3728b50cd ("ACPI: PM: s2idle: Avoid possible race related to the EC GPE")
Cc: 5.4+ <stable@vger.kernel.org> # 5.4+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
It is an unused wrapper forcing kmalloc allocation for registering
nosave regions. Also, rename __register_nosave_region() to
register_nosave_region() now that there is no need for disambiguation.
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
The buffer handling in pm_show_wakelocks() is tricky, and hopefully
correct. Ensure it really is correct by using sysfs_emit_at() which
handles all of the tricky string handling logic in a PAGE_SIZE buffer
for us automatically as this is a sysfs file being read from.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Theoretically, when the hardware signature in FACS changes, the OS
is supposed to gracefully decline to attempt to resume from S4:
"If the signature has changed, OSPM will not restore the system
context and can boot from scratch"
In practice, Windows doesn't do this and many laptop vendors do allow
the signature to change especially when docking/undocking, so it would
be a bad idea to simply comply with the specification by default in the
general case.
However, there are use cases where we do want the compliant behaviour
and we know it's safe. Specifically, when resuming virtual machines where
we know the hypervisor has changed sufficiently that resume will fail.
We really want to be able to *tell* the guest kernel not to try, so it
boots cleanly and doesn't just crash. This patch provides a way to opt
in to the spec-compliant behaviour on the command line.
A follow-up patch may do this automatically for certain "known good"
machines based on a DMI match, or perhaps just for all hypervisor
guests since there's no good reason a hypervisor would change the
hardware_signature that it exposes to guests *unless* it wants them
to obey the ACPI specification.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
snapshot_write() is inappropriately limiting the amount of data that can
be written in cases where a partial page has already been written. For
example, one would expect to be able to write 1 byte, then 4095 bytes to
the snapshot device, and have both of those complete fully (since now
we're aligned to a page again). But what ends up happening is we write 1
byte, then 4094/4095 bytes complete successfully.
The reason is that simple_write_to_buffer()'s second argument is the
total size of the buffer, not the size of the buffer minus the offset.
Since simple_write_to_buffer() accounts for the offset in its
implementation, snapshot_write() can just pass the full page size
directly down.
Signed-off-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Commit 39fbef4b0f ("PM: hibernate: Get block device exclusively in
swsusp_check()") changed the opening mode of the block device to
(FMODE_READ | FMODE_EXCL).
In the corresponding calls to swsusp_close(), the mode is still just
FMODE_READ which triggers the warning in blkdev_flush_mapping() on
resume from hibernate.
So, use the mode (FMODE_READ | FMODE_EXCL) also when closing the
device.
Fixes: 39fbef4b0f ("PM: hibernate: Get block device exclusively in swsusp_check()")
Signed-off-by: Thomas Zeitlhofer <thomas.zeitlhofer+lkml@ze-it.at>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Pull power management updates from Rafael Wysocki:
"These make the power management of PCI devices with ACPI companions
more straightforwad, add support for inefficient operating performance
points to the Energy model and make cpufreq handle them as
appropriate, rearrange the handling of cpuidle during system PM
transitions, update a few cpufreq drivers and intel_idle, fix assorded
issues and clean up code in multiple places.
Specifics:
- Add support for inefficient operating performance points to the
Energy Model and modify cpufreq to use them properly (Vincent
Donnefort).
- Rearrange the DTPM framework code to simplify it and make it easier
to follow (Daniel Lezcano).
- Fix power intialization in DTPM (Daniel Lezcano).
- Add CPU load consideration when estimating the instaneous power
consumption in DTPM (Daniel Lezcano).
- Fix cpu->pstate.turbo_freq initialization in intel_pstate (Zhang
Rui).
- Make intel_pstate process HWP Guaranteed change notifications from
the processor (Srinivas Pandruvada).
- Fix typo in cpufreq.h (Rafael Wysocki).
- Fix tegra driver to handle BPMP errors properly (Mikko Perttunen).
- Fix the parameter usage of the newly added perf-domain API (Hector
Yuan).
- Minor cleanups to cppc, vexpress and s3c244x drivers (Han Wang,
Guenter Roeck, and Arnd Bergmann).
- Fix kobject memory leaks in cpuidle error paths (Anel
Orazgaliyeva).
- Make intel_idle enable interrupts before entering C1 on some Xeon
processor models (Artem Bityutskiy).
- Clean up hib_wait_io() (Falla Coulibaly).
- Fix sparse warnings in hibernation-related code (Anders Roxell).
- Use vzalloc() and kzalloc() instead of their open-coded equivalents
in hibernation-related code (Cai Huoqing).
- Prevent user space from crashing the kernel by attempting to
restore the system state from a swap partition in use (Ye Bin).
- Do not let "syscore" devices runtime-suspend during system PM
transitions (Rafael Wysocki).
- Do not pause cpuidle in the suspend-to-idle path (Rafael Wysocki).
- Pause cpuidle later and resume it earlier during system PM
transitions (Rafael Wysocki).
- Make system suspend code use valid_state() consistently (Rafael
Wysocki).
- Add support for enabling wakeup IRQs after invoking the
->runtime_suspend() callback and make two drivers use it (Chunfeng
Yun).
- Make the association of ACPI device objects with PCI devices more
straightforward and simplify the code doing that for all devices in
general (Rafael Wysocki).
- Eliminate struct pci_platform_pm_ops and handle the both of its
users (PCI and Intel MID) directly in the PCI bus code (Rafael
Wysocki).
- Simplify and clarify ACPI PCI device PM helpers (Rafael Wysocki).
- Fix ordering of operations in pci_back_from_sleep() (Rafael
Wysocki).
- Make exynos-ppmu use hyphens in DT properties (Krzysztof
Kozlowski).
- Simplify parsing event-type from DT in exynos-ppmu (Krzysztof
Kozlowski).
- Strengthen check for freq_table in devfreq (Samuel Holland)"
* tag 'pm-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (49 commits)
cpufreq: Fix parameter in parse_perf_domain()
usb: mtu3: enable wake-up interrupt after runtime_suspend called
usb: xhci-mtk: enable wake-up interrupt after runtime_suspend called
PM / wakeirq: support enabling wake-up irq after runtime_suspend called
PM / devfreq: Strengthen check for freq_table
devfreq: exynos-ppmu: simplify parsing event-type from DT
devfreq: exynos-ppmu: use node names with hyphens
cpufreq: intel_pstate: Fix cpu->pstate.turbo_freq initialization
PM: suspend: Use valid_state() consistently
PM: sleep: Pause cpuidle later and resume it earlier during system transitions
PM: suspend: Do not pause cpuidle in the suspend-to-idle path
PM: sleep: Do not let "syscore" devices runtime-suspend during system transitions
PM: hibernate: Get block device exclusively in swsusp_check()
powercap/drivers/dtpm: Fix power limit initialization
powercap/drivers/dtpm: Scale the power with the load
powercap/drivers/dtpm: Use container_of instead of a private data field
powercap/drivers/dtpm: Simplify the dtpm table
powercap/drivers/dtpm: Encapsulate even more the code
PM: hibernate: swap: Use vzalloc() and kzalloc()
PM: hibernate: fix sparse warnings
...
Merge Energy Model and power capping updates for 5.16-rc1:
- Add support for inefficient operating performance points to the
Energy Model and modify cpufreq to use them properly (Vincent
Donnefort).
- Rearrange the DTPM framework code to simplify it and make it easier
to follow (Daniel Lezcano).
- Fix power intialization in DTPM (Daniel Lezcano).
- Add CPU load consideration when estimating the instaneous power
consumption in DTPM (Daniel Lezcano).
* pm-em:
cpufreq: mediatek-hw: Fix cpufreq_table_find_index_dl() call
PM: EM: Mark inefficiencies in CPUFreq
cpufreq: Use CPUFREQ_RELATION_E in DVFS governors
cpufreq: Introducing CPUFREQ_RELATION_E
cpufreq: Add an interface to mark inefficient frequencies
cpufreq: Make policy min/max hard requirements
PM: EM: Allow skipping inefficient states
PM: EM: Extend em_perf_domain with a flag field
PM: EM: Mark inefficient states
PM: EM: Fix inefficient states detection
* powercap:
powercap/drivers/dtpm: Fix power limit initialization
powercap/drivers/dtpm: Scale the power with the load
powercap/drivers/dtpm: Use container_of instead of a private data field
powercap/drivers/dtpm: Simplify the dtpm table
powercap/drivers/dtpm: Encapsulate even more the code
Make valid_state() check if the ->enter callback is present in
suspend_ops (only PM_SUSPEND_TO_IDLE can be valid otherwise) and
make sleep_state_supported() call valid_state() consistently to
validate the states other than PM_SUSPEND_TO_IDLE.
While at it, clean up the comment in valid_state().
No expected functional impact.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Commit 8651f97bd9 ("PM / cpuidle: System resume hang fix with
cpuidle") that introduced cpuidle pausing during system suspend
did that to work around a platform firmware issue causing systems
to hang during resume if CPUs were allowed to enter idle states
in the system suspend and resume code paths.
However, pausing cpuidle before the last phase of suspending
devices is the source of an otherwise arbitrary difference between
the suspend-to-idle path and other system suspend variants, so it is
cleaner to do that later, before taking secondary CPUs offline (it
is still safer to take secondary CPUs offline with cpuidle paused,
though).
Modify the code accordingly, but in order to avoid code duplication,
introduce new wrapper functions, pm_sleep_disable_secondary_cpus()
and pm_sleep_enable_secondary_cpus(), to combine cpuidle_pause()
and cpuidle_resume(), respectively, with the handling of secondary
CPUs during system-wide transitions to sleep states.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
It is pointless to pause cpuidle in the suspend-to-idle path,
because it is going to be resumed in the same path later and
pausing it does not serve any particular purpose in that case.
Rework the code to avoid doing that.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
Replace vmalloc()/memset() with vzalloc() and kmalloc()/memset() with
kzalloc() to simplify the code.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
When building the kernel with sparse enabled 'C=1' the following
warnings shows up:
kernel/power/swap.c:390:29: warning: incorrect type in assignment (different base types)
kernel/power/swap.c:390:29: expected int ret
kernel/power/swap.c:390:29: got restricted blk_status_t
This is due to function hib_wait_io() returns a 'blk_status_t' which is
a bitwise u8. Commit 5416da01ff ("PM: hibernate: Remove
blk_status_to_errno in hib_wait_io") seemed to have mixed up the return
type. However, the 4e4cbee93d ("block: switch bios to blk_status_t")
actually broke the behaviour by returning the wrong type.
Rework so function hib_wait_io() returns a 'int' instead of
'blk_status_t' and make sure to call function
blk_status_to_errno(hb->error)' when returning from function
hib_wait_io() a int gets returned.
Fixes: 4e4cbee93d ("block: switch bios to blk_status_t")
Fixes: 5416da01ff ("PM: hibernate: Remove blk_status_to_errno in hib_wait_io")
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Currently show_workqueue_state shows the state of all workqueues and of
all worker pools. In certain cases we may need to dump state of only a
specific workqueue or worker pool. For example in destroy_workqueue we
only need to show state of the workqueue which is getting destroyed.
So rename show_workqueue_state to show_all_workqueues(to signify it
dumps state of all busy workqueues) and divide it into more granular
functions (show_one_workqueue and show_one_worker_pool), that would show
states of individual workqueues and worker pools and can be used in
cases such as the one mentioned above.
Also, as mentioned earlier, make destroy_workqueue dump data pertaining
to only the workqueue that is being destroyed and make user(s) of
earlier interface(show_workqueue_state), use new interface
(show_all_workqueues).
Signed-off-by: Imran Khan <imran.f.khan@oracle.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Revert commit bfcc1e67ff ("PM: sleep: Do not assume that "mem" is
always present"), because it breaks compatibility with user space
utilities assuming that "mem" will always be present in
/sys/power/state.
Fixes: bfcc1e67ff ("PM: sleep: Do not assume that "mem" is always present")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
The Energy Model has a 1:1 mapping between OPPs and performance states
(em_perf_state). If a CPUFreq driver registers an Energy Model,
inefficiencies found by the latter can be applied to CPUFreq.
Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
The new performance domain flag EM_PERF_DOMAIN_SKIP_INEFFICIENCIES allows
to not take into account inefficient states when estimating energy
consumption. This intends to let the Energy Model know that CPUFreq itself
will skip inefficiencies and such states don't need to be part of the
estimation anymore.
Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Merge the current "milliwatts" option into a "flag" field. This intends to
prepare the extension of this structure for inefficient states support in
the Energy Model.
Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Some SoCs, such as the sd855 have OPPs within the same performance domain,
whose cost is higher than others with a higher frequency. Even though
those OPPs are interesting from a cooling perspective, it makes no sense
to use them when the device can run at full capacity. Those OPPs handicap
the performance domain, when choosing the most energy-efficient CPU and
are wasting energy. They are inefficient.
Hence, add support for such OPPs to the Energy Model. The table can now
be read skipping inefficient performance states (and by extension,
inefficient OPPs).
Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Currently, a debug message is printed if an inefficient state is detected
in the Energy Model. Unfortunately, it won't detect if the first state is
inefficient or if two successive states are. Fix this behavior.
Fixes: 27871f7a8a (PM: Introduce an Energy Model management framework)
Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
Reviewed-by: Quentin Perret <qperret@google.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
blk_status_to_errno doesn't appear to perform extra work besides
converting blk_status_t to integer. This patch removes that unnecessary
conversion as the return type of the function is blk_status_t.
Signed-off-by: Falla Coulibaly <fallacoulibalyz@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
An implementation of suspend_ops is allowed to reject the PM_SUSPEND_MEM
suspend type from its ->valid() callback, we should not assume that it
is always present as this is not a correct reflection of what a firmware
interface may support.
Fixes: 406e79385f ("PM / sleep: System sleep state selection interface rework")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
* pm-pci:
PCI: PM: Enable PME if it can be signaled from D3cold
PCI: PM: Avoid forcing PCI_D0 for wakeup reasons inconsistently
PCI: Use pci_update_current_state() in pci_enable_device_flags()
* pm-sleep:
PM: sleep: unmark 'state' functions as kernel-doc
PM: sleep: check RTC features instead of ops in suspend_test
PM: sleep: s2idle: Replace deprecated CPU-hotplug functions
* pm-domains:
PM: domains: Fix domain attach for CONFIG_PM_OPP=n
arm64: dts: sc7180: Add required-opps for i2c
PM: domains: Add support for 'required-opps' to set default perf state
opp: Don't print an error if required-opps is missing
* powercap:
powercap: Add Power Limit4 support for Alder Lake SoC
powercap: intel_rapl: Replace deprecated CPU-hotplug functions
Fix kernel-doc warnings in kernel/power/main.c by unmarking the
comment block as kernel-doc notation. This eliminates the following
kernel-doc warnings:
kernel/power/main.c:593: warning: expecting prototype for state(). Prototype was for state_show() instead
kernel/power/main.c:593: warning: Function parameter or member 'kobj' not described in 'state_show'
kernel/power/main.c:593: warning: Function parameter or member 'attr' not described in 'state_show'
kernel/power/main.c:593: warning: Function parameter or member 'buf' not described in 'state_show'
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
