(b4 forces me to send this as v2, however previous version was RFC and b4
uses RFC as v1; but I don't want to break b4 tracking and b4 comparison)
Series generalises the GS101-specific cpuhotplug, cpuidle and PMU interrupt
generation block support, which is currently implemented specifically for
the google GS101 SoC, to make it reusable by other Samsung Exynos SoCs.
The PMU interrupt generation IP block introduced for google GS101 is a
standard Samsung Exynos block found in other SoCs, including Exynos850,
and it is not strictly exclusive to google Exynos-based platforms.
Access to this block is required to implement and enable cpuhotplug
on Exynos850-based boards.
As a next steps it will be possible to enable idle states on top of it.
First patches work on DT bindings to reflect that Exynos850 SoC predates
gs101 one, introduce new samsung,pmu-intr-gen-syscon phandle.
Then series generalises ("Exynosizes") cpuhotplug/cpuidle routines by
deferring platform-specific PMU and PMU-intr-gen updates to platform-
specific callbacks and then finally introduces new file exynos850-pmu.c
where such callbacks are implemented for Exynos850. Last commit adds
pmu_intr_gen DT node to exynos850.dtsi.
This series was tested on Exynos850 WinLink E850-96 board:
-- by spinning "chcpu -d 1-7; chcpu -e 1-7" in a loop for a few hours;
-- by running script [1] that randomly offlines or onlines random cpus
for a few hours.
I do not have access to a development google Pixel 6 or other gs101-based
devices to verify. I tried to implement it in way to not break anything
for gs101, but testing from others is highly appreciated.
Otherwise, if it can be tested on a "normal" pixel6 phone without breaking
userdata/android there, then please point me to instructions.
Will check sashiko after submitting this to see if anything can be improved.
Thanks,
Alexey
[1]: https://github.com/laklimov/xlam/blob/main/e850_cpuhotplug_random.sh
Signed-off-by: Alexey Klimov <alexey.klimov@linaro.org>
---
Changes in v2:
- moved gs101 cpu {offline,online} callbacks to gs101-pmu.c, updated MAINTAINERS;
- added new file exynos850-pmu.c with cpu {offline,online} callbacks and
exynos850 pmu data;
- new patch that adds exynos850-pmu.c to MAINTAINERS;
- moved pmu_intr_gen to right after pmu_system_controller@11860000;
- merged two patches that update google,gs101-pmu-intr-gen.yaml together,
now rename and adding exynos850 entry goes in a single patch;
- commits 5 and 6 from RFC series are merged together and reworked,
cpu_pmu_{offline,online} callbacks are moved into pmu_data struct, and
callbacks now need pmu_context as an argument, exynos_pmu_context and
CPU_INFORM defines are moved to exynos-pmu.h, gs101 callbacks
renamed. It is really better to check commit description.
- Link to RFC (v1 from b4 point of view):
https://lore.kernel.org/r/20260226-exynos850-cpuhotplug-v1-0-71d7c4063382@linaro.org
---
Alexey Klimov (7):
dt-bindings: soc: move,rename google,gs101-pmu-intr-gen and add exynos850
dt-bindings: soc: samsung: exynos-pmu: add samsung,pmu-intr-gen phandle
dt-bindings: soc: samsung: exynos-pmu: deprecate google,pmu-intr-gen-syscon
soc: samsung: exynos-pmu: generalise gs101-specific cpu{idle,hotplug} for Exynos SoCs
soc: samsung: exynos-pmu: add Exynos850 CPU hotplug support
MAINTAINERS: add exynos850-pmu.c to Exynos850 entry
arm64: dts: exynos850: add PMU interrupt generation node
.../bindings/soc/samsung/exynos-pmu.yaml | 24 ++++
.../samsung,exynos850-pmu-intr-gen.yaml} | 8 +-
MAINTAINERS | 4 +-
arch/arm64/boot/dts/exynos/exynos850.dtsi | 6 +
drivers/soc/samsung/Makefile | 2 +-
drivers/soc/samsung/exynos-pmu.c | 127 +++++----------------
drivers/soc/samsung/exynos-pmu.h | 32 ++++++
drivers/soc/samsung/exynos850-pmu.c | 78 +++++++++++++
drivers/soc/samsung/gs101-pmu.c | 57 +++++++++
include/linux/soc/samsung/exynos-regs-pmu.h | 15 ++-
10 files changed, 245 insertions(+), 108 deletions(-)
---
base-commit: 3b058d1aeeeff27a7289529c4944291613b364e9
change-id: 20260226-exynos850-cpuhotplug-69f1976eefa8
Best regards,
--
Alexey Klimov <alexey.klimov@linaro.org>