[ndctl PATCH] daxctl: emit counts of total and online memblocks

Fir daxctl device listings, if in 'system-ram' mode, it is useful to
know whether the memory associated with the device is online or not.
Since the memory is comprised of a number of 'memblocks', and it is
possible (albeit rare) to have a subset of them online, and the rest
offline, we can't just use a boolean online-or-offline flag for the
state.

Add a couple of counts, one for the total number of memblocks associated
with the device, and another for the ones that are online.

Link: https://github.com/pmem/ndctl/issues/139
Cc: Dan Williams <[email protected]>
Cc: Dave Hansen <[email protected]>
Reported-by: Steve Scargall <[email protected]>
Signed-off-by: Vishal Verma <[email protected]>
---
 util/json.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/util/json.c b/util/json.c
index ca0167b..a8d2412 100644
--- a/util/json.c
+++ b/util/json.c
@@ -482,6 +482,17 @@ struct json_object *util_daxctl_dev_to_json(struct daxctl_dev *dev,
 		json_object_object_add(jdev, "mode", jobj);
 
 	if (mem && daxctl_dev_get_resource(dev) != 0) {
+		int num_sections = daxctl_memory_num_sections(mem);
+		int num_online = daxctl_memory_is_online(mem);
+
+		jobj = json_object_new_int(num_online);
+		if (jobj)
+			json_object_object_add(jdev, "online_memblocks", jobj);
+
+		jobj = json_object_new_int(num_sections);
+		if (jobj)
+			json_object_object_add(jdev, "total_memblocks", jobj);
+
 		movable = daxctl_memory_is_movable(mem);
 		if (movable == 1)
 			jobj = json_object_new_boolean(true);
-- 
2.30.2
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