driver core: platform: expose numa_node to users in sysfs
Some platform devices like ARM SMMU are memory-mapped and populated by ACPI/IORT. In this case, NUMA topology of those platform devices are exported by firmware as well. Software might care about the numa_node of those devices in order to achieve NUMA locality. This patch will show the numa_node for this kind of devices in sysfs. For those platform devices without numa, numa_node won't be visible. Cc: Prime Zeng <prime.zeng@hisilicon.com> Cc: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Barry Song <song.bao.hua@hisilicon.com> Link: https://lore.kernel.org/r/20200619030045.81956-1-song.bao.hua@hisilicon.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -18,3 +18,13 @@ Description:
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devices to opt-out of driver binding using a driver_override
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name such as "none". Only a single driver may be specified in
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the override, there is no support for parsing delimiters.
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What: /sys/bus/platform/devices/.../numa_node
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Date: June 2020
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Contact: Barry Song <song.bao.hua@hisilicon.com>
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Description:
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This file contains the NUMA node to which the platform device
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is attached. It won't be visible if the node is unknown. The
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value comes from an ACPI _PXM method or a similar firmware
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source. Initial users for this file would be devices like
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arm smmu which are populated by arm64 acpi_iort.
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@ -1076,13 +1076,37 @@ static ssize_t driver_override_show(struct device *dev,
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}
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static DEVICE_ATTR_RW(driver_override);
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static ssize_t numa_node_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", dev_to_node(dev));
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}
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static DEVICE_ATTR_RO(numa_node);
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static umode_t platform_dev_attrs_visible(struct kobject *kobj, struct attribute *a,
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int n)
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{
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struct device *dev = container_of(kobj, typeof(*dev), kobj);
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if (a == &dev_attr_numa_node.attr &&
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dev_to_node(dev) == NUMA_NO_NODE)
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return 0;
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return a->mode;
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}
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static struct attribute *platform_dev_attrs[] = {
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&dev_attr_modalias.attr,
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&dev_attr_numa_node.attr,
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&dev_attr_driver_override.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(platform_dev);
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static struct attribute_group platform_dev_group = {
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.attrs = platform_dev_attrs,
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.is_visible = platform_dev_attrs_visible,
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};
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__ATTRIBUTE_GROUPS(platform_dev);
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static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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