linux-kernel - Re: [PATCH 12/16] dax: Add numa_node to the default device-dax attributes

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Date:   Tue, 12 Nov 2019 17:20:03 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Dan Williams <dan.j.williams@...el.com>, linux-nvdimm@...ts.01.org
Cc:     peterz@...radead.org, dave.hansen@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 12/16] dax: Add numa_node to the default device-dax attributes

Dan Williams <dan.j.williams@...el.com> writes:

> It is confusing that device-dax instances publish a 'target_node'
> attribute, but not a 'numa_node'. The 'numa_node' information is
> available elsewhere in the sysfs device hierarchy, but it is not obvious
> and not reliable from one device-dax instance-type (e.g. child devices
> of nvdimm namespaces) to the next (e.g. 'hmem' devices defined by EFI
> Specific Purpose Memory and the ACPI HMAT).
>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>

> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: Vishal Verma <vishal.l.verma@...el.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  drivers/dax/bus.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
> index ce6d648d7670..0879b9663eb7 100644
> --- a/drivers/dax/bus.c
> +++ b/drivers/dax/bus.c
> @@ -322,6 +322,13 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
>  }
>  static DEVICE_ATTR_RO(modalias);
>  
> +static ssize_t numa_node_show(struct device *dev,
> +		struct device_attribute *attr, char *buf)
> +{
> +	return sprintf(buf, "%d\n", dev_to_node(dev));
> +}
> +static DEVICE_ATTR_RO(numa_node);
> +
>  static umode_t dev_dax_visible(struct kobject *kobj, struct attribute *a, int n)
>  {
>  	struct device *dev = container_of(kobj, struct device, kobj);
> @@ -329,6 +336,8 @@ static umode_t dev_dax_visible(struct kobject *kobj, struct attribute *a, int n)
>  
>  	if (a == &dev_attr_target_node.attr && dev_dax_target_node(dev_dax) < 0)
>  		return 0;
> +	if (a == &dev_attr_numa_node.attr && !IS_ENABLED(CONFIG_NUMA))
> +		return 0;
>  	return a->mode;
>  }
>  
> @@ -337,6 +346,7 @@ static struct attribute *dev_dax_attributes[] = {
>  	&dev_attr_size.attr,
>  	&dev_attr_target_node.attr,
>  	&dev_attr_resource.attr,
> +	&dev_attr_numa_node.attr,
>  	NULL,
>  };
>  
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