qmp: add query-memory-devices command

... allowing to get state of present memory devices.
Currently implemented only for PCDIMMDevice.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/mem/pc-dimm.c

@@ -23,6 +23,45 @@
 #include "qapi/visitor.h"
 #include "qemu/range.h"
 
+int qmp_pc_dimm_device_list(Object *obj, void *opaque)
+{
+    MemoryDeviceInfoList ***prev = opaque;
+
+    if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
+        DeviceState *dev = DEVICE(obj);
+
+        if (dev->realized) {
+            MemoryDeviceInfoList *elem = g_new0(MemoryDeviceInfoList, 1);
+            MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1);
+            PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1);
+            DeviceClass *dc = DEVICE_GET_CLASS(obj);
+            PCDIMMDevice *dimm = PC_DIMM(obj);
+
+            if (dev->id) {
+                di->has_id = true;
+                di->id = g_strdup(dev->id);
+            }
+            di->hotplugged = dev->hotplugged;
+            di->hotpluggable = dc->hotpluggable;
+            di->addr = dimm->addr;
+            di->slot = dimm->slot;
+            di->node = dimm->node;
+            di->size = object_property_get_int(OBJECT(dimm), PC_DIMM_SIZE_PROP,
+                                               NULL);
+            di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem));
+
+            info->dimm = di;
+            elem->value = info;
+            elem->next = NULL;
+            **prev = elem;
+            *prev = &elem->next;
+        }
+    }
+
+    object_child_foreach(obj, qmp_pc_dimm_device_list, opaque);
+    return 0;
+}
+
 static int pc_dimm_slot2bitmap(Object *obj, void *opaque)
 {
     unsigned long *bitmap = opaque;

include/hw/mem/pc-dimm.h

@@ -76,4 +76,6 @@ uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
                                Error **errp);
 
 int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp);
+
+int qmp_pc_dimm_device_list(Object *obj, void *opaque);
 #endif

qapi-schema.json

@@ -3194,3 +3194,54 @@
 # Since: 2.1
 ##
 { 'command': 'query-memdev', 'returns': ['Memdev'] }
+# @PCDIMMDeviceInfo:
+#
+# PCDIMMDevice state information
+#
+# @id: #optional device's ID
+#
+# @addr: physical address, where device is mapped
+#
+# @size: size of memory that the device provides
+#
+# @slot: slot number at which device is plugged in
+#
+# @node: NUMA node number where device is plugged in
+#
+# @memdev: memory backend linked with device
+#
+# @hotplugged: true if device was hotplugged
+#
+# @hotpluggable: true if device if could be added/removed while machine is running
+#
+# Since: 2.1
+##
+{ 'type': 'PCDIMMDeviceInfo',
+  'data': { '*id': 'str',
+            'addr': 'int',
+            'size': 'int',
+            'slot': 'int',
+            'node': 'int',
+            'memdev': 'str',
+            'hotplugged': 'bool',
+            'hotpluggable': 'bool'
+          }
+}
+
+##
+# @MemoryDeviceInfo:
+#
+# Union containing information about a memory device
+#
+# Since: 2.1
+##
+{ 'union': 'MemoryDeviceInfo', 'data': {'dimm': 'PCDIMMDeviceInfo'} }
+
+##
+# @query-memory-devices
+#
+# Lists available memory devices and their state
+#
+# Since: 2.1
+##
+{ 'command': 'query-memory-devices', 'returns': ['MemoryDeviceInfo'] }

qmp-commands.hx

@@ -3611,4 +3611,31 @@ Example (1):
      ]
    }
 
+EQMP
+
+    {
+        .name       = "query-memory-devices",
+        .args_type  = "",
+        .mhandler.cmd_new = qmp_marshal_input_query_memory_devices,
+    },
+
+SQMP
+@query-memory-devices
+--------------------
+
+Return a list of memory devices.
+
+Example:
+-> { "execute": "query-memory-devices" }
+<- { "return": [ { "data":
+                      { "addr": 5368709120,
+                        "hotpluggable": true,
+                        "hotplugged": true,
+                        "id": "d1",
+                        "memdev": "/objects/memX",
+                        "node": 0,
+                        "size": 1073741824,
+                        "slot": 0},
+                   "type": "dimm"
+                 } ] }
 EQMP

qmp.c

@@ -28,6 +28,7 @@
 #include "qapi/qmp-input-visitor.h"
 #include "hw/boards.h"
 #include "qom/object_interfaces.h"
+#include "hw/mem/pc-dimm.h"
 
 NameInfo *qmp_query_name(Error **errp)
 {
@@ -628,3 +629,13 @@ void qmp_object_del(const char *id, Error **errp)
     }
     object_unparent(obj);
 }
+
+MemoryDeviceInfoList *qmp_query_memory_devices(Error **errp)
+{
+    MemoryDeviceInfoList *head = NULL;
+    MemoryDeviceInfoList **prev = &head;
+
+    qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
+
+    return head;
+}

stubs/Makefile.objs

@@ -37,3 +37,4 @@ stub-obj-y += vmstate.o
 stub-obj-$(CONFIG_WIN32) += fd-register.o
 stub-obj-y += cpus.o
 stub-obj-y += kvm.o
+stub-obj-y += qmp_pc_dimm_device_list.o

stubs/qmp_pc_dimm_device_list.c

@@ -0,0 +1,7 @@
+#include "qom/object.h"
+#include "hw/mem/pc-dimm.h"
+
+int qmp_pc_dimm_device_list(Object *obj, void *opaque)
+{
+   return 0;
+}