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libnvdimm: Add sysfs numa_node to NVDIMM devices

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Add support of sysfs 'numa_node' to I/O-related NVDIMM devices
under /sys/bus/nd/devices, regionN, namespaceN.0, and bttN.x.

An example of numa_node values on a 2-socket system with a single
NVDIMM range on each socket is shown below.
  /sys/bus/nd/devices
  |-- btt0.0/numa_node:0
  |-- btt1.0/numa_node:1
  |-- btt1.1/numa_node:1
  |-- namespace0.0/numa_node:0
  |-- namespace1.0/numa_node:1
  |-- region0/numa_node:0
  |-- region1/numa_node:1

These numa_node files are then linked under the block class of
their device names.
  /sys/class/block/pmem0/device/numa_node:0
  /sys/class/block/pmem1s/device/numa_node:1

This enables numactl(8) to accept 'block:' and 'file:' paths of
pmem and btt devices as shown in the examples below.
  numactl --preferred block:pmem0 --show
  numactl --preferred file:/dev/pmem1s --show

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Toshi Kani 2015-06-19 12:18:34 -06:00 committed by Dan Williams
parent 41d7a6d637
commit 74ae66c3b1
5 changed files with 34 additions and 0 deletions
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1
drivers/acpi/nfit.c
View File

@ -873,6 +873,7 @@ static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
&nd_region_attribute_group,
&nd_mapping_attribute_group,
&nd_device_attribute_group,
&nd_numa_attribute_group,
&acpi_nfit_region_attribute_group,
NULL,
};

1
drivers/nvdimm/btt_devs.c
View File

@ -293,6 +293,7 @@ static struct attribute_group nd_btt_attribute_group = {
static const struct attribute_group *nd_btt_attribute_groups[] = {
&nd_btt_attribute_group,
&nd_device_attribute_group,
&nd_numa_attribute_group,
NULL,
};

30
drivers/nvdimm/bus.c
View File

@ -280,6 +280,36 @@ struct attribute_group nd_device_attribute_group = {
};
EXPORT_SYMBOL_GPL(nd_device_attribute_group);
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 struct attribute *nd_numa_attributes[] = {
&dev_attr_numa_node.attr,
NULL,
};
static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a,
int n)
{
if (!IS_ENABLED(CONFIG_NUMA))
return 0;
return a->mode;
}
/**
* nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
*/
struct attribute_group nd_numa_attribute_group = {
.attrs = nd_numa_attributes,
.is_visible = nd_numa_attr_visible,
};
EXPORT_SYMBOL_GPL(nd_numa_attribute_group);
int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
{
dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);

1
drivers/nvdimm/namespace_devs.c
View File

@ -1228,6 +1228,7 @@ static struct attribute_group nd_namespace_attribute_group = {
static const struct attribute_group *nd_namespace_attribute_groups[] = {
&nd_device_attribute_group,
&nd_namespace_attribute_group,
&nd_numa_attribute_group,
NULL,
};

1
include/linux/libnvdimm.h
View File

@ -38,6 +38,7 @@ enum {
extern struct attribute_group nvdimm_bus_attribute_group;
extern struct attribute_group nvdimm_attribute_group;
extern struct attribute_group nd_device_attribute_group;
extern struct attribute_group nd_numa_attribute_group;
extern struct attribute_group nd_region_attribute_group;
extern struct attribute_group nd_mapping_attribute_group;