device-dax: Add a 'resource' attribute
device-dax based devices were missing a 'resource' attribute to indicate the physical address range contributed by the device in question. This information is desirable to userspace tooling that may want to use the dax device as system-ram, and wants to selectively hotplug and online the memory blocks associated with a given device. Without this, the tooling would have to parse /proc/iomem for the memory ranges contributed by dax devices, which can be a workaround, but it is far easier to provide this information in the sysfs hierarchy. Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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9e0babf2c0
Коммит
40cdc60ac1
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@ -295,6 +295,22 @@ static ssize_t target_node_show(struct device *dev,
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}
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}
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static DEVICE_ATTR_RO(target_node);
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static DEVICE_ATTR_RO(target_node);
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static unsigned long long dev_dax_resource(struct dev_dax *dev_dax)
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{
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struct dax_region *dax_region = dev_dax->region;
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return dax_region->res.start;
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}
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static ssize_t resource_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dev_dax *dev_dax = to_dev_dax(dev);
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return sprintf(buf, "%#llx\n", dev_dax_resource(dev_dax));
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}
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static DEVICE_ATTR_RO(resource);
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static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
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static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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char *buf)
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{
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{
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@ -313,6 +329,8 @@ static umode_t dev_dax_visible(struct kobject *kobj, struct attribute *a, int n)
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if (a == &dev_attr_target_node.attr && dev_dax_target_node(dev_dax) < 0)
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if (a == &dev_attr_target_node.attr && dev_dax_target_node(dev_dax) < 0)
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return 0;
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return 0;
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if (a == &dev_attr_resource.attr)
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return 0400;
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return a->mode;
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return a->mode;
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}
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}
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@ -320,6 +338,7 @@ static struct attribute *dev_dax_attributes[] = {
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&dev_attr_modalias.attr,
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&dev_attr_modalias.attr,
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&dev_attr_size.attr,
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&dev_attr_size.attr,
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&dev_attr_target_node.attr,
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&dev_attr_target_node.attr,
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&dev_attr_resource.attr,
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NULL,
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NULL,
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};
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};
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