linux-kernel - Re: [PATCH 1/1] of: to support binding numa node to root subnode(non-bus)

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Date:	Mon, 24 Aug 2015 08:25:31 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Zhen Lei <thunder.leizhen@...wei.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	devicetree <devicetree@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
	Tianhong Ding <dingtianhong@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH 1/1] of: to support binding numa node to root subnode(non-bus)

+benh

On Mon, Aug 24, 2015 at 7:30 AM, Zhen Lei <thunder.leizhen@...wei.com> wrote:
> If use of_platform_populate to scan dt-nodes and add devices, the
> subnode of root(such as /smmu), when being scanned and invoke

You should have a bus as the sub-node of root rather than devices
directly off of root. You still have a problem though...

> of_device_add, the ofdev->dev.parent is always equal &platform_bus. So
> that, function set_dev_node will not be called. And in device_add,
> dev_to_node(parent) always return NUMA_NO_NODE.
>
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> ---
>  drivers/base/core.c | 2 +-
>  drivers/of/device.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index dafae6d..5df4f46b 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -1017,7 +1017,7 @@ int device_add(struct device *dev)
>                 dev->kobj.parent = kobj;
>
>         /* use parent numa_node */
> -       if (parent)
> +       if (parent && (parent != &platform_bus))

This is only fixing one specific case, but I think things are broken
for any case where the NUMA associativity if not set at the top level
bus node. I think this should be something like:

if (parent && (dev_to_node(dev) != NO_NUMA_NODE))

Then the OF code can set the node however it wants.

>                 set_dev_node(dev, dev_to_node(parent));
>
>         /* first, register with generic layer. */
> diff --git a/drivers/of/device.c b/drivers/of/device.c
> index 8b91ea2..96ebece 100644
> --- a/drivers/of/device.c
> +++ b/drivers/of/device.c
> @@ -63,7 +63,7 @@ int of_device_add(struct platform_device *ofdev)
>         /* device_add will assume that this device is on the same node as
>          * the parent. If there is no parent defined, set the node
>          * explicitly */
> -       if (!ofdev->dev.parent)
> +       if (!ofdev->dev.parent || (ofdev->dev.parent == &platform_bus))

And then remove the if here.

>                 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
>
>         return device_add(&ofdev->dev);
> --
> 2.5.0
>
>
> --
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