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device-dax: Add a 'target_node' attribute 

The target-node attribute is the Linux numa-node that a device-dax
instance may create when it is online. Prior to being online the
device's 'numa_node' property reflects the closest online cpu node which
is the typical expectation of a device 'numa_node'. Once it is online it
becomes its own distinct numa node, i.e. 'target_node'.

Export the 'target_node' property to give userspace tooling the ability
to predict the effective numa-node from a device-dax instance configured
to provide 'System RAM' capacity.

Cc: Vishal Verma <vishal.l.verma@intel.com>
Reported-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2019-02-20 11:39:36 -08:00
parent 664525b2d8
commit 21c75763a3
1 changed files with 28 additions and 0 deletions
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28
drivers/dax/bus.c
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@ -279,13 +279,41 @@ static ssize_t size_show(struct device *dev,
} }
static DEVICE_ATTR_RO(size); static DEVICE_ATTR_RO(size);
static int dev_dax_target_node(struct dev_dax *dev_dax)
{
struct dax_region *dax_region = dev_dax->region;
return dax_region->target_node;
}
static ssize_t target_node_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dev_dax *dev_dax = to_dev_dax(dev);
return sprintf(buf, "%d\n", dev_dax_target_node(dev_dax));
}
static DEVICE_ATTR_RO(target_node);
static umode_t dev_dax_visible(struct kobject *kobj, struct attribute *a, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct dev_dax *dev_dax = to_dev_dax(dev);
if (a == &dev_attr_target_node.attr && dev_dax_target_node(dev_dax) < 0)
return 0;
return a->mode;
}
static struct attribute *dev_dax_attributes[] = { static struct attribute *dev_dax_attributes[] = {
&dev_attr_size.attr, &dev_attr_size.attr,
&dev_attr_target_node.attr,
NULL, NULL,
}; };
static const struct attribute_group dev_dax_attribute_group = { static const struct attribute_group dev_dax_attribute_group = {
.attrs = dev_dax_attributes, .attrs = dev_dax_attributes,
.is_visible = dev_dax_visible,
}; };
static const struct attribute_group *dax_attribute_groups[] = { static const struct attribute_group *dax_attribute_groups[] = {