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Date: Tue, 2 Jun 2015 18:26:52 -0600
From: Toshi Kani <toshi.kani@...com>
To: rjw@...ysocki.net, dan.j.williams@...el.com
Cc: linux-acpi@...r.kernel.org, linux-nvdimm@...ts.01.org,
linux-kernel@...r.kernel.org, Toshi Kani <toshi.kani@...com>
Subject: [PATCH 3/3] libnvdimm: Add sysfs numa_node to NVDIMM devices
Since NVDIMMs are installed on memory slots, they expose the NUMA
topology of a platform.
This patch adds support of sysfs 'numa_node' to the NVDIMM devices
under /sys/bus/nd/devices, such as regionN, namespaceN.0, and bttN.
When bttN is not set up, its numa_node returns -1 (NUMA_NO_NODE).
nmemN/numa_node always returns -1 for now since this device is for
dimm-ioctl message interface and has little use of NUMA. It can be
enhanced later to set a valid value if necessary.
Here is an example of numa_node values on a 2-socket system with
a single NVDIMM range on each socket.
/sys/bus/nd/devices
|-- btt0/numa_node:-1
|-- btt1/numa_node:0
|-- namespace0.0/numa_node:0
|-- namespace1.0/numa_node:1
|-- nmem0/numa_node:-1
|-- nmem1/numa_node:-1
|-- region0/numa_node:0
|-- region1/numa_node:1
With this change, numactl(8) accepts '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@...com>
---
drivers/acpi/nfit.c | 2 ++
drivers/nvdimm/btt.c | 2 ++
drivers/nvdimm/bus.c | 12 ++++++++++++
drivers/nvdimm/nd.h | 1 +
drivers/nvdimm/region.c | 1 +
drivers/nvdimm/region_devs.c | 1 +
include/linux/libnvdimm.h | 1 +
7 files changed, 20 insertions(+)
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index 5731e4a..a255f3a 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -1255,6 +1255,8 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
ndr_desc->res = &res;
ndr_desc->provider_data = nfit_spa;
ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
+ ndr_desc->numa_node = acpi_map_pxm_to_node(spa->proximity_domain);
+
list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
struct nd_mapping *nd_mapping;
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 2d7ce9e..3b3e115 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1369,6 +1369,8 @@ static int nd_btt_probe(struct device *dev)
rc = -ENOMEM;
goto err_btt;
}
+
+ set_dev_node(dev, nd_region->numa_node);
dev_set_drvdata(dev, btt);
return 0;
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index d8a1794..5c34e68 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -339,9 +339,21 @@ static ssize_t devtype_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(devtype);
+#ifdef CONFIG_NUMA
+static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%d\n", dev->numa_node);
+}
+DEVICE_ATTR_RO(numa_node);
+#endif
+
static struct attribute *nd_device_attributes[] = {
&dev_attr_modalias.attr,
&dev_attr_devtype.attr,
+#ifdef CONFIG_NUMA
+ &dev_attr_numa_node.attr,
+#endif
NULL,
};
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index c807379..fefd8f6 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -108,6 +108,7 @@ struct nd_region {
u64 ndr_size;
u64 ndr_start;
int id, num_lanes;
+ int numa_node;
void *provider_data;
struct nd_interleave_set *nd_set;
struct nd_mapping mapping[0];
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c
index 373eab4..783220e 100644
--- a/drivers/nvdimm/region.c
+++ b/drivers/nvdimm/region.c
@@ -123,6 +123,7 @@ static int nd_region_probe(struct device *dev)
num_ns->active = rc;
num_ns->count = rc + err;
+ set_dev_node(dev, nd_region->numa_node);
dev_set_drvdata(dev, num_ns);
if (err == 0)
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 86adbd8..352bc80 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -627,6 +627,7 @@ static noinline struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus
nd_region->provider_data = ndr_desc->provider_data;
nd_region->nd_set = ndr_desc->nd_set;
nd_region->num_lanes = ndr_desc->num_lanes;
+ nd_region->numa_node = ndr_desc->numa_node;
ida_init(&nd_region->ns_ida);
dev = &nd_region->dev;
dev_set_name(dev, "region%d", nd_region->id);
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 96b9507..5d0c75a 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -78,6 +78,7 @@ struct nd_region_desc {
struct nd_interleave_set *nd_set;
void *provider_data;
int num_lanes;
+ int numa_node;
};
struct nvdimm_bus;
--
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