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ACPI: container: Add power domain control methods
Platform devices which supports power control are often required to be power off/on together with the devices in the same power domain. However, there isn't a generic driver that support the power control logic of these devices. ACPI container seems to be a good place to hold these control logic. Add platform devices in the same power domain in a ACPI container, we can easily get the locality information about these devices and can moniter the power of these devices in the same power domain together. This patch provide three userspace control interface to control the power of devices together in the container: - on: power up the devices in the container and then online these devices which will be triggered by BIOS. - off: offline and eject the child devices in the container which are ejectable. - pxms: show the pxms of devices which are present in the container. In our scenario, we need to control the power of HBM memory devices which can be power consuming and will only be used in some specialized scenarios, such as HPC. HBM memory devices in a socket are in the same power domain, and should be power off/on together. We have come up with an idea that put these power control logic in a specialized driver, but ACPI container seems to be a more generic place to hold these control logic. Signed-off-by: Zhang Zekun <zhangzekun11@huawei.com>
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