Add a new member N_COHERENT_DEVICE into node_states[] nodemask array to
enlist all those nodes which contain only coherent device memory. Also
creates a new sysfs interface /sys/devices/system/node/is_coherent_device
to list down all those nodes which has coherent device memory.
Signed-off-by: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
---
Documentation/ABI/stable/sysfs-devices-node | 7 +++++++
drivers/base/node.c | 6 ++++++
include/linux/nodemask.h | 3 +++
mm/memory_hotplug.c | 10 ++++++++++
4 files changed, 26 insertions(+)
diff --git a/Documentation/ABI/stable/sysfs-devices-node b/Documentation/ABI/stable/sysfs-devices-node
index 5b2d0f0..5538791 100644
--- a/Documentation/ABI/stable/sysfs-devices-node
+++ b/Documentation/ABI/stable/sysfs-devices-node
@@ -29,6 +29,13 @@ Description:
Nodes that have regular or high memory.
Depends on CONFIG_HIGHMEM.
+What: /sys/devices/system/node/is_coherent_device
+Date: October 2016
+Contact: Linux Memory Management list <linux-mm@xxxxxxxxx>
+Description:
+ Lists the nodemask of nodes that have coherent memory.
+ Depends on CONFIG_COHERENT_DEVICE.
+
What: /sys/devices/system/node/nodeX
Date: October 2002
Contact: Linux Memory Management list <linux-mm@xxxxxxxxx>
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 5548f96..5b5dd89 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -661,6 +661,9 @@ static struct node_attr node_state_attr[] = {
[N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
#endif
[N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
+#ifdef CONFIG_COHERENT_DEVICE
+ [N_COHERENT_DEVICE] = _NODE_ATTR(is_coherent_device, N_COHERENT_DEVICE),
+#endif
};
static struct attribute *node_state_attrs[] = {
@@ -674,6 +677,9 @@ static struct attribute *node_state_attrs[] = {
&node_state_attr[N_MEMORY].attr.attr,
#endif
&node_state_attr[N_CPU].attr.attr,
+#ifdef CONFIG_COHERENT_DEVICE
+ &node_state_attr[N_COHERENT_DEVICE].attr.attr,
+#endif
NULL
};
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index f746e44..605cb0d 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -393,6 +393,9 @@ enum node_states {
N_MEMORY = N_HIGH_MEMORY,
#endif
N_CPU, /* The node has one or more cpus */
+#ifdef CONFIG_COHERENT_DEVICE
+ N_COHERENT_DEVICE, /* The node has coherent device memory */
+#endif
NR_NODE_STATES
};
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 9629273..8f03962 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1044,6 +1044,11 @@ static void node_states_set_node(int node, struct memory_notify *arg)
if (arg->status_change_nid_high >= 0)
node_set_state(node, N_HIGH_MEMORY);
+#ifdef CONFIG_COHERENT_DEVICE
+ if (isolated_cdm_node(node))
+ node_set_state(node, N_COHERENT_DEVICE);
+#endif
+
node_set_state(node, N_MEMORY);
}
@@ -1858,6 +1863,11 @@ static void node_states_clear_node(int node, struct memory_notify *arg)
if ((N_MEMORY != N_HIGH_MEMORY) &&
(arg->status_change_nid >= 0))
node_clear_state(node, N_MEMORY);
+
+#ifdef CONFIG_COHERENT_DEVICE
+ if (isolated_cdm_node(node))
+ node_clear_state(node, N_COHERENT_DEVICE);
+#endif
}
static int __ref __offline_pages(unsigned long start_pfn,
--
2.1.0
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