From 74ae66c3b14ffa94c8d2dea201cdf8e6203d13d5 Mon Sep 17 00:00:00 2001
From: Toshi Kani <toshi.kani@hp.com>
Date: Fri, 19 Jun 2015 12:18:34 -0600
Subject: [PATCH] libnvdimm: Add sysfs numa_node to NVDIMM devices
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>
---
drivers/acpi/nfit.c | 1 +
drivers/nvdimm/btt_devs.c | 1 +
drivers/nvdimm/bus.c | 30 ++++++++++++++++++++++++++++++
drivers/nvdimm/namespace_devs.c | 1 +
include/linux/libnvdimm.h | 1 +
5 files changed, 34 insertions(+)
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index d96c8fe974dda..2161fa178c8d0 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -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,
};
diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index 661aacedc1400..6ac8c0fea3ec2 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -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,
};
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 2053446438526..8eb22c0ca7ce4 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -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);
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 27d69bd3b4d6f..fef0dd80d4adb 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -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,
};
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 30b3deaafd515..75e3af01ee325 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -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;
--
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