linux-kernel - Re: [PATCH RFC 1/5] ACPI / containers : add support for ACPI0010 processor container

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Message-ID: <554C78C2.706@linaro.org>
Date:	Fri, 08 May 2015 16:50:10 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Sudeep Holla <sudeep.holla@....com>, linux-acpi@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Al Stone <ahs3@...hat.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH RFC 1/5] ACPI / containers : add support for ACPI0010
 processor container

Hi Sudeep,

On 2015年05月06日 22:31, Sudeep Holla wrote:
> ACPI 6.0 adds support for optional processor container device which may
> contain child objects that are either processor devices or other processor
> containers. This allows representing hierarchical processor topologies.
>
> It is declared using the _HID of ACPI0010. It may also have _CID of
> PNP0A05, which represents a generic container device.

Container device helps support hotplug of nodes, CPUs, and memory,
does this container device ACPI0010 used for the same purpose?

For my understanding, ACPI0010 is used to abstract CPU topology
like cluster, not for hotplug purpose, maybe I missed something,
or you just need this container driver for later use?

Thanks
Hanjun

>
> This patch enables the support for these ACPI processor containers.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
>   Documentation/memory-hotplug.txt | 2 +-
>   drivers/acpi/container.c         | 1 +
>   2 files changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/memory-hotplug.txt b/Documentation/memory-hotplug.txt
> index ce2cfcf35c27..bdbf7bb88d5d 100644
> --- a/Documentation/memory-hotplug.txt
> +++ b/Documentation/memory-hotplug.txt
> @@ -124,7 +124,7 @@ config options.
>
>   - As a related configuration, if your box has a feature of NUMA-node hotplug
>     via ACPI, then this option is necessary too.
> -    ACPI0004,PNP0A05 and PNP0A06 Container Driver (under ACPI Support menu)
> +    ACPI0004, ACPI0010, PNP0A05 and PNP0A06 Container Driver (under ACPI Support menu)
>       (CONFIG_ACPI_CONTAINER).
>       This option can be kernel module too.
>
> diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
> index c8ead9f97375..8c041b9ac359 100644
> --- a/drivers/acpi/container.c
> +++ b/drivers/acpi/container.c
> @@ -36,6 +36,7 @@ ACPI_MODULE_NAME("container");
>
>   static const struct acpi_device_id container_device_ids[] = {
>   	{"ACPI0004", 0},
> +	{"ACPI0010", 0},
>   	{"PNP0A05", 0},
>   	{"PNP0A06", 0},
>   	{"", 0},
>
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