[ndctl PATCH 08/15] cxl/list: Record cxl objects in json objects

[Dan Williams]

In preparation for reusing 'cxl list' object selection in other utilities,
like 'cxl create-region', record the associated cxl object in the json
object. For example, enable 'cxl create-region -d decoderX.Y' to lookup the
memdevs that result from 'cxl list -M -d decoderX.Y'.

This sets up future design decisions for code that wants to walk the
topology. It can either open-code its own object walk, or get the json-c
representation of a query and use that. Unless the use case knows exactly
the object it wants it is likely more powerful to specify a
cxl_filter_walk() query and then walk the topology result.

Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
---
 cxl/json.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/cxl/json.c b/cxl/json.c
index 1b1669ab021d..9264f5fcb21e 100644
--- a/cxl/json.c
+++ b/cxl/json.c
@@ -365,6 +365,8 @@ struct json_object *util_cxl_memdev_to_json(struct 
cxl_memdev *memdev,
                if (jobj)
                        json_object_object_add(jdev, "partition_info", jobj);
        }
+
+       json_object_set_userdata(jdev, memdev, NULL);
        return jdev;
 }
 
@@ -416,6 +418,7 @@ void util_cxl_dports_append_json(struct json_object *jport,
                        json_object_object_add(jdport, "id", jobj);
 
                json_object_array_add(jdports, jdport);
+               json_object_set_userdata(jdport, dport, NULL);
        }
 
        json_object_object_add(jport, "dports", jdports);
@@ -439,6 +442,7 @@ struct json_object *util_cxl_bus_to_json(struct cxl_bus 
*bus,
        if (jobj)
                json_object_object_add(jbus, "provider", jobj);
 
+       json_object_set_userdata(jbus, bus, NULL);
        return jbus;
 }
 
@@ -563,6 +567,7 @@ struct json_object *util_cxl_decoder_to_json(struct 
cxl_decoder *decoder,
                                               jobj);
        }
 
+       json_object_set_userdata(jdecoder, decoder, NULL);
        return jdecoder;
 }
 
@@ -621,6 +626,7 @@ void util_cxl_mappings_append_json(struct json_object 
*jregion,
                        json_object_object_add(jmapping, "decoder", jobj);
 
                json_object_array_add(jmappings, jmapping);
+               json_object_set_userdata(jmapping, mapping, NULL);
        }
 
        json_object_object_add(jregion, "mappings", jmappings);
@@ -686,6 +692,7 @@ struct json_object *util_cxl_region_to_json(struct 
cxl_region *region,
 
        util_cxl_mappings_append_json(jregion, region, flags);
 
+       json_object_set_userdata(jregion, region, NULL);
        return jregion;
 }
 
@@ -751,6 +758,7 @@ void util_cxl_targets_append_json(struct json_object 
*jdecoder,
                        json_object_object_add(jtarget, "id", jobj);
 
                json_object_array_add(jtargets, jtarget);
+               json_object_set_userdata(jtarget, target, NULL);
        }
 
        json_object_object_add(jdecoder, "targets", jtargets);
@@ -785,6 +793,7 @@ static struct json_object *__util_cxl_port_to_json(struct 
cxl_port *port,
                        json_object_object_add(jport, "state", jobj);
        }
 
+       json_object_set_userdata(jport, port, NULL);
        return jport;
 }