driver core: platform: expose numa_node to users in sysfs (4a60406d) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-bus-platform

+10 −0

Original line number	Diff line number	Diff line
		@@ -18,3 +18,13 @@ Description:
		devices to opt-out of driver binding using a driver_override
		name such as "none". Only a single driver may be specified in
		the override, there is no support for parsing delimiters.

		What: /sys/bus/platform/devices/.../numa_node
		Date: June 2020
		Contact: Barry Song <song.bao.hua@hisilicon.com>
		Description:
		This file contains the NUMA node to which the platform device
		is attached. It won't be visible if the node is unknown. The
		value comes from an ACPI _PXM method or a similar firmware
		source. Initial users for this file would be devices like
		arm smmu which are populated by arm64 acpi_iort.

+25 −1

Original line number	Diff line number	Diff line
		@@ -1076,13 +1076,37 @@ static ssize_t driver_override_show(struct device *dev,
		}
		static DEVICE_ATTR_RW(driver_override);

		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 platform_dev_attrs_visible(struct kobject kobj, struct attribute a,
		int n)
		{
		struct device dev = container_of(kobj, typeof(dev), kobj);

		if (a == &dev_attr_numa_node.attr &&
		dev_to_node(dev) == NUMA_NO_NODE)
		return 0;

		return a->mode;
		}

		static struct attribute *platform_dev_attrs[] = {
		&dev_attr_modalias.attr,
		&dev_attr_numa_node.attr,
		&dev_attr_driver_override.attr,
		NULL,
		};
		ATTRIBUTE_GROUPS(platform_dev);

		static struct attribute_group platform_dev_group = {
		.attrs = platform_dev_attrs,
		.is_visible = platform_dev_attrs_visible,
		};
		__ATTRIBUTE_GROUPS(platform_dev);

		static int platform_uevent(struct device dev, struct kobj_uevent_env env)
		{