Re: Question about ACPI 6 and the Linux kernel

[Hanjun Guo <hanjun.guo@linaro.org>]

Hi Kevin,

On 08/04/2015 12:35 PM, Kevin Wilson wrote:
> Hi all,
> Is the current ACPI linux subsystem, that you find in the official Linus tree,
>   compliant (even partially) with ACPI 6 ? (which was released in April 2015)
>
> or is it now compliant only with ACPI 5 ?

ACPI 6 have lots of new features, such as add support for NVDIMM
(persistent memory), hierarchical lower-power idle states of CPUs, CPU
clusters, and some support for ARM platforms (GIC, SMMU and etc.),
and more...

so what the specific features are you referring to?

>
> What are the plans for ACPI 6? Is there already some git branch for it ?

For all the ACPI 6 new features, ACPICA already add its support in 4.2,
and some of the ACPI driver support also is ready, such as support for
persistent memory [1] is ready, and Linaro is leading the ACPI 6.0 for
ARM support, but as far as I can know, some of ACPI 6.0 features are
still under development at now.

I think the main support for ACPI 6.0 is in Rafael's tree:
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git

[1]: https://lwn.net/Articles/640891/

Thanks
Hanjun