kernel/linux.git/drivers/pmdomain/core.c, branch linux-7.1.y

pmdomain: core: Fix detach procedure for virtual devices in genpd

2026-04-27T12:36:17+00:00

If a device is attached to a PM domain through genpd_dev_pm_attach_by_id(), genpd calls pm_runtime_enable() for the corresponding virtual device that it registers. While this avoids boilerplate code in drivers, there is no corresponding call to pm_runtime_disable() in genpd_dev_pm_detach(). This means these virtual devices are typically detached from its genpd, while runtime PM remains enabled for them, which is not how things are designed to work. In worst cases it may lead to critical errors, like a NULL pointer dereference bug in genpd_runtime_suspend(), which was recently reported. For another case, we may end up keeping an unnecessary vote for a performance state for the device. To fix these problems, let's add this missing call to pm_runtime_disable() in genpd_dev_pm_detach(). Reported-by: Geert Uytterhoeven Closes: https://lore.kernel.org/all/CAMuHMdWapT40hV3c+CSBqFOW05aWcV1a6v_NiJYgoYi0i9_PDQ@mail.gmail.com/ Fixes: 3c095f32a92b ("PM / Domains: Add support for multi PM domains per device to genpd") Cc: stable@vger.kernel.org Tested-by: Geert Uytterhoeven Signed-off-by: Ulf Hansson

pmdomain: core: Extend statistics for domain idle states with s2idle data

2026-04-01T11:07:31+00:00

To allow user space to monitor the selection of the domain idle state during s2idle for a CPU PM domain, let's extend the debugfs support in genpd with this information. Suggested-by: Dhruva Gole Reviewed-by: Dhruva Gole Reviewed-by: Kevin Hilman Signed-off-by: Ulf Hansson

pmdomain: core: Show latency/residency for domain idle states in debugfs

2026-04-01T11:07:31+00:00

Similar to how cpuidle provides the values for latency and residency for CPU's idle states through sysfs, let's make the corresponding data for PM domain's idle states available for user space, via genpd's debugfs support. Suggested-by: Dhruva Gole Reviewed-by: Dhruva Gole Reviewed-by: Kevin Hilman Signed-off-by: Ulf Hansson

pmdomain: core: Restructure domain idle states data for genpd in debugfs

2026-04-01T11:07:31+00:00

To prepare for additional information to be added for the domain idle states in genpd's debugfs, let's make the existing information denser. To allow that, let's move the static information of the domain idle states into a separate debugfs file. Reviewed-by: Kevin Hilman Signed-off-by: Ulf Hansson

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

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 ...

pmdomain: Respect the CPU system wakeup QoS limit for s2idle

2025-11-25T18:01:29+00:00

A CPU system wakeup QoS limit may have been requested by user space. To avoid breaking this constraint when entering a low power state during s2idle through genpd, let's extend the corresponding genpd governor for CPUs. More precisely, during s2idle let the genpd governor select a suitable domain idle state, by taking into account the QoS limit. Reviewed-by: Dhruva Gole Reviewed-by: Kevin Hilman (TI) Tested-by: Kevin Hilman (TI) Signed-off-by: Ulf Hansson Link: https://patch.msgid.link/20251125112650.329269-3-ulf.hansson@linaro.org Signed-off-by: Rafael J. Wysocki

pmdomain: core: Allow power-off for out-of-band wakeup-capable devices

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

Currently, if a device is configured as a system wakeup source, the PM domain core avoids powering off its power domain during system-wide suspend. However, this can lead to unnecessary power consumption, especially for devices whose wakeup logic resides in an always-on domain, i.e., devices with out-of-band wakeup capability. To address this, add a check for device_out_band_wakeup() in genpd_finish_suspend(). If the device supports out-of-band wakeup, its power domain can be safely powered off, just like regular devices without wakeup enabled. And same check in genpd_finish_resume(). This change improves power efficiency without compromising wakeup functionality. Signed-off-by: Peng Fan Reviewed-by: Dhruva Gole Signed-off-by: Ulf Hansson

pmdomain: core: Restore behaviour for disabling unused PM domains

2025-09-11T10:36:14+00:00

Recent changes to genpd prevents those PM domains being powered-on during initialization from being powered-off during the boot sequence. Based upon whether CONFIG_PM_CONFIG_PM_GENERIC_DOMAINS_OF is set of not, genpd relies on the sync_state mechanism or the genpd_power_off_unused() (which is a late_initcall_sync), to understand when it's okay to allow these PM domains to be powered-off. This new behaviour in genpd has lead to problems on different platforms. Let's therefore restore the behavior of genpd_power_off_unused(). Moreover, let's introduce GENPD_FLAG_NO_STAY_ON, to allow genpd OF providers to opt-out from the new behaviour. Link: https://lore.kernel.org/all/20250701114733.636510-1-ulf.hansson@linaro.org/ Reported-by: Geert Uytterhoeven Link: https://lore.kernel.org/all/20250902-rk3576-lockup-regression-v1-1-c4a0c9daeb00@collabora.com/ Reported-by: Nicolas Frattaroli Fixes: 0e789b491ba0 ("pmdomain: core: Leave powered-on genpds on until sync_state") Fixes: 13a4b7fb6260 ("pmdomain: core: Leave powered-on genpds on until late_initcall_sync") Tested-by: Heiko Stuebner Reviewed-by: Geert Uytterhoeven Tested-by: Geert Uytterhoeven Signed-off-by: Ulf Hansson