kernel/linux.git/include/linux/pm.h, branch v6.19.11

PM: sleep: core: Avoid bit field races related to work_in_progress

2026-03-04T12:21:33+00:00

[ Upstream commit 0491f3f9f664e7e0131eb4d2a8b19c49562e5c64 ] In all of the system suspend transition phases, the async processing of a device may be carried out in parallel with power.work_in_progress updates for the device's parent or suppliers and if it touches bit fields from the same group (for example, power.must_resume or power.wakeup_path), bit field corruption is possible. To avoid that, turn work_in_progress in struct dev_pm_info into a proper bool field and relocate it to save space. Fixes: aa7a9275ab81 ("PM: sleep: Suspend async parents after suspending children") Fixes: 443046d1ad66 ("PM: sleep: Make suspend of devices more asynchronous") Signed-off-by: Xuewen Yan Closes: https://lore.kernel.org/linux-pm/20260203063459.12808-1-xuewen.yan@unisoc.com/ Cc: All applicable [ rjw: Added subject and changelog ] Link: https://patch.msgid.link/CAB8ipk_VX2VPm706Jwa1=8NSA7_btWL2ieXmBgHr2JcULEP76g@mail.gmail.com Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin

Merge tag 'pmdomain-v6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/linux-pm

2025-12-04T21:50:39+00:00

Pull pmdomain updates from Ulf Hansson: "pmdomain core: - Allow power-off for out-of-band wakeup-capable devices - Drop the redundant call to dev_pm_domain_detach() for the amba bus - Extend the genpd governor for CPUs to account for IPIs pmdomain providers: - bcm: Add support for BCM2712 - mediatek: Add support for MFlexGraphics power domains - mediatek: Add support for MT8196 power domains - qcom: Add RPMh power domain support for Kaanapali - rockchip: Add support for RV1126B pmdomain consumers: - usb: dwc3: Enable out of band wakeup for i.MX95 - usb: chipidea: Enable out of band wakeup for i.MX95" * tag 'pmdomain-v6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/linux-pm: (26 commits) pmdomain: Extend the genpd governor for CPUs to account for IPIs smp: Introduce a helper function to check for pending IPIs pmdomain: mediatek: convert from clk round_rate() to determine_rate() amba: bus: Drop dev_pm_domain_detach() call pmdomain: bcm: bcm2835-power: Prepare to support BCM2712 pmdomain: mediatek: mtk-mfg: select MAILBOX in Kconfig pmdomain: mediatek: Add support for MFlexGraphics pmdomain: mediatek: Fix build-errors cpuidle: psci: Replace deprecated strcpy in psci_idle_init_cpu pmdomain: rockchip: Add support for RV1126B pmdomain: mediatek: Add support for MT8196 HFRPSYS power domains pmdomain: mediatek: Add support for MT8196 SCPSYS power domains pmdomain: mediatek: Add support for secure HWCCF infra power on pmdomain: mediatek: Add support for Hardware Voter power domains pmdomain: qcom: rpmhpd: Add RPMh power domain support for Kaanapali usb: dwc3: imx8mp: Set out of band wakeup for i.MX95 usb: chipidea: ci_hdrc_imx: Set out of band wakeup for i.MX95 usb: chipidea: core: detach power domain for ci_hdrc platform device pmdomain: core: Allow power-off for out-of-band wakeup-capable devices PM: wakeup: Add out-of-band system wakeup support for devices ...

PM: wakeup: Add out-of-band system wakeup support for devices

2025-11-19T17:06:49+00:00

Some devices can wake up the system from suspend even when their power domains are turned off. This is possible because their system-wakeup logic resides in an always-on power domain - indicating that they support out-of-band system wakeup. Currently, PM domain core doesn't power off such devices if they are marked as system wakeup sources. To better represent devices with out-of-band wakeup capability, this patch introduces a new flag out_band_wakeup in 'struct dev_pm_info'. Two helper APIs are added: - device_set_out_band_wakeup() - to mark a device as having out-of-band wakeup capability. - device_out_band_wakeup() - to query the flag. Allow the PM core and drivers to distinguish between regular and out-of-band wakeup sources, enable more accurate power management decision. Signed-off-by: Peng Fan Reviewed-by: Dhruva Gole Signed-off-by: Ulf Hansson

PM: Introduce new PMSG_POWEROFF event

2025-11-14T16:05:53+00:00

PMSG_POWEROFF will be used for the PM core to allow differentiating between a hibernation or shutdown sequence when re-using callbacks for common code. Hibernation is started by writing a hibernation method (such as 'platform' 'shutdown', or 'reboot') to use into /sys/power/disk and writing 'disk' to /sys/power/state. Shutdown is initiated with the reboot() syscall with arguments on whether to halt the system or power it off. Tested-by: Eric Naim Signed-off-by: Mario Limonciello (AMD) Link: https://patch.msgid.link/20251112224025.2051702-2-superm1@kernel.org Signed-off-by: Rafael J. Wysocki

PM: console: Fix memory allocation error handling in pm_vt_switch_required()

2025-10-18T12:38:23+00:00

The pm_vt_switch_required() function fails silently when memory allocation fails, offering no indication to callers that the operation was unsuccessful. This behavior prevents drivers from handling allocation errors correctly or implementing retry mechanisms. By ensuring that failures are reported back to the caller, drivers can make informed decisions, improve robustness, and avoid unexpected behavior during critical power management operations. Change the function signature to return an integer error code and modify the implementation to return -ENOMEM when kmalloc() fails. Update both the function declaration and the inline stub in include/linux/pm.h to maintain consistency across CONFIG_VT_CONSOLE_SLEEP configurations. The function now returns: - 0 on success (including when updating existing entries) - -ENOMEM when memory allocation fails This change improves error reporting without breaking existing callers, as the current callers in drivers/video/fbdev/core/fbmem.c already ignore the return value, making this a backward-compatible improvement. Reviewed-by: Lyude Paul Signed-off-by: Malaya Kumar Rout Reviewed-by: Dhruva Gole Reviewed-by: Lyude Paul Link: https://patch.msgid.link/20251013193028.89570-1-mrout@redhat.com Signed-off-by: Rafael J. Wysocki

Merge branches 'pm-misc' and 'pm-tools'

2025-07-22T16:07:11+00:00

Merge miscellaneous power management updates and cpupower utility updates for 6.17-rc1: - Update contact information in the PM ABI docs and maintainer information in the power domains DT binding (Rafael Wysocki) - Update PM header inclusions to follow the IWYU (Include What You Use) principle (Andy Shevchenko) - Add flags to specify power on attach/detach for PM domains, make the driver core detach PM domains in device_unbind_cleanup(), and drop the dev_pm_domain_detach() call from the platform bus type (Claudiu Beznea) - Improve Python binding's Makefile for cpupower (John B. Wyatt IV) - Fix printing of CORE, CPU fields in cpupower-monitor (Gautham Shenoy) * pm-misc: PM: docs: Use my kernel.org address in ABI docs and DT bindings driver core: platform: Drop dev_pm_domain_detach() call PM: domains: Detach on device_unbind_cleanup() PM: domains: Add flags to specify power on attach/detach PM: Don't use "proxy" headers * pm-tools: cpupower: Improve Python binding's Makefile pm: cpupower: Fix printing of CORE, CPU fields in cpupower-monitor pm: cpupower: Fix the snapshot-order of tsc,mperf, clock in mperf_stop()

PM: domains: Detach on device_unbind_cleanup()

2025-07-07T18:41:21+00:00

The dev_pm_domain_attach() function is typically used in bus code alongside dev_pm_domain_detach(), often following patterns like: static int bus_probe(struct device *_dev) { struct bus_driver *drv = to_bus_driver(dev->driver); struct bus_device *dev = to_bus_device(_dev); int ret; // ... ret = dev_pm_domain_attach(_dev, true); if (ret) return ret; if (drv->probe) ret = drv->probe(dev); // ... } static void bus_remove(struct device *_dev) { struct bus_driver *drv = to_bus_driver(dev->driver); struct bus_device *dev = to_bus_device(_dev); if (drv->remove) drv->remove(dev); dev_pm_domain_detach(_dev); } When the driver's probe function uses devres-managed resources that depend on the power domain state, those resources are released later during device_unbind_cleanup(). Releasing devres-managed resources that depend on the power domain state after detaching the device from its PM domain can cause failures. For example, if the driver uses devm_pm_runtime_enable() in its probe function, and the device's clocks are managed by the PM domain, then during removal the runtime PM is disabled in device_unbind_cleanup() after the clocks have been removed from the PM domain. It may happen that the devm_pm_runtime_enable() action causes the device to be runtime- resumed. If the driver specific runtime PM APIs access registers directly, this will lead to accessing device registers without clocks being enabled. Similar issues may occur with other devres actions that access device registers. Add detach_power_off member to struct dev_pm_info, to be used later in device_unbind_cleanup() as the power_off argument for dev_pm_domain_detach(). This is a preparatory step toward removing dev_pm_domain_detach() calls from bus remove functions. Since the current PM domain detach functions (genpd_dev_pm_detach() and acpi_dev_pm_detach()) already set dev->pm_domain = NULL, there should be no issues with bus drivers that still call dev_pm_domain_detach() in their remove functions. Signed-off-by: Claudiu Beznea Reviewed-by: Ulf Hansson Link: https://patch.msgid.link/20250703112708.1621607-3-claudiu.beznea.uj@bp.renesas.com Signed-off-by: Rafael J. Wysocki

PM: sleep: Add strict_midlayer flag to struct dev_pm_info

2025-07-03T15:10:40+00:00

Add a new flag, called strict_midlayer, to struct dev_pm_info, along with helper functions for updating and reading its value, to allow middle layer code that provides proper callbacks for device suspend- resume during system-wide PM transitions to let pm_runtime_force_suspend() and and pm_runtime_force_resume() know that they should only invoke runtime PM callbacks coming from the device's driver. Namely, if this flag is set, pm_runtime_force_suspend() and and pm_runtime_force_resume() will invoke runtime PM callbacks provided by the device's driver directly with the assumption that they have been called via a middle layer callback for device suspend or resume, respectively. For instance, acpi_general_pm_domain provides specific callback functions for system suspend, acpi_subsys_suspend(), acpi_subsys_suspend_late() and acpi_subsys_suspend_noirq(), and it does not expect its runtime suspend callback function, acpi_subsys_runtime_suspend(), to be invoked at any point during system suspend. In particular, it does not expect that function to be called from within any of the system suspend callback functions mentioned above which would happen if a device driver collaborating with acpi_general_pm_domain used pm_runtime_force_suspend() as its callback function for any system suspend phase later than "prepare". The new flag allows this expectation of acpi_general_pm_domain to be formally expressed, which is going to be done subsequently. Signed-off-by: Rafael J. Wysocki Reviewed-by: Ulf Hansson Link: https://patch.msgid.link/24017035.6Emhk5qWAg@rjwysocki.net

PM: Don't use "proxy" headers

2025-07-03T15:02:23+00:00

Update header inclusions to follow IWYU (Include What You Use) principle. Signed-off-by: Andy Shevchenko Link: https://patch.msgid.link/20250626154244.324265-1-andriy.shevchenko@linux.intel.com Signed-off-by: Rafael J. Wysocki

PM: sleep: Remove unused pm_generic_ wrappers

2025-03-12T20:02:50+00:00

pm_generic_thaw_early() has been unused since 2016's commit 294f47ffd55c ("PM / Domains: Remove redundant system PM callbacks") pm_generic_freeze_late() has been unused since 2019's commit 3cd7957e85e6 ("ACPI: PM: Simplify and fix PM domain hibernation callbacks") Remove them. Signed-off-by: Dr. David Alan Gilbert Link: https://patch.msgid.link/20250307021750.457600-1-linux@treblig.org Signed-off-by: Rafael J. Wysocki