[v2,16/17] libnvdimm: Add sysfs numa_node to NVDIMM devices
diff mbox

Message ID 20150625093743.40066.92148.stgit@dwillia2-desk3.jf.intel.com
State New
Headers show

Commit Message

Dan Williams June 25, 2015, 9:37 a.m. UTC
From: Toshi Kani <toshi.kani@hp.com>

Add support of sysfs 'numa_node' to I/O-related NVDIMM devices
under /sys/bus/nd/devices, regionN, namespaceN.0, and bttN.
When bttN is not set up, its numa_node returns -1 (NUMA_NO_NODE).

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/numa_node:-1
  |-- btt1/numa_node:0
  |-- 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/pmem0s/device/numa_node:0
  /sys/class/block/pmem1/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/pmem0s --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(+)


--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Comments

Toshi Kani June 26, 2015, 2:21 a.m. UTC | #1
On Thu, 2015-06-25 at 05:37 -0400, Dan Williams wrote:
> From: Toshi Kani <toshi.kani@hp.com>
> 
> Add support of sysfs 'numa_node' to I/O-related NVDIMM devices
> under /sys/bus/nd/devices, regionN, namespaceN.0, and bttN.
> When bttN is not set up, its numa_node returns -1 (NUMA_NO_NODE).
> 
> 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/numa_node:-1
>   |-- btt1/numa_node:0
>   |-- 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/pmem0s/device/numa_node:0
>   /sys/class/block/pmem1/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/pmem0s --show
> 
> Signed-off-by: Toshi Kani <toshi.kani@hp.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Can you please update the commit log with the following?  It reflects
the changes in sysfs btt files.

Thanks,
-Toshi

=====
From: Toshi Kani <toshi.kani@hp.com>

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>

--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Dan Williams June 26, 2015, 3:26 p.m. UTC | #2
On Thu, Jun 25, 2015 at 7:21 PM, Toshi Kani <toshi.kani@hp.com> wrote:
> On Thu, 2015-06-25 at 05:37 -0400, Dan Williams wrote:
>> From: Toshi Kani <toshi.kani@hp.com>
>>
>> Add support of sysfs 'numa_node' to I/O-related NVDIMM devices
>> under /sys/bus/nd/devices, regionN, namespaceN.0, and bttN.
>> When bttN is not set up, its numa_node returns -1 (NUMA_NO_NODE).
>>
>> 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/numa_node:-1
>>   |-- btt1/numa_node:0
>>   |-- 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/pmem0s/device/numa_node:0
>>   /sys/class/block/pmem1/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/pmem0s --show
>>
>> Signed-off-by: Toshi Kani <toshi.kani@hp.com>
>> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
>
> Can you please update the commit log with the following?  It reflects
> the changes in sysfs btt files.

Done, thanks!
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Patch
diff mbox

diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index d96c8fe974dd..2161fa178c8d 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 b6724cfbcfca..2dfb529f4d35 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -294,6 +294,7 @@  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 ec59f1f26d95..1380954a6593 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -274,6 +274,36 @@  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 27d69bd3b4d6..fef0dd80d4ad 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 30b3deaafd51..75e3af01ee32 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;