[Qemu-devel] [PATCH 1/5] qmp: add query-memory-devices command

[Igor Mammedov <imammedo@redhat.com>]

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

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
v2:
 * fix typos an json syntax in QMP example
 * make 'id' optional to allow command work with
   anonymous memory devices
---
 hw/mem/pc-dimm.c                |   39 ++++++++++++++++++++++++++++
 include/hw/mem/pc-dimm.h        |    2 +
 qapi-schema.json                |   53 +++++++++++++++++++++++++++++++++++++++
 qmp-commands.hx                 |   27 ++++++++++++++++++++
 qmp.c                           |   11 ++++++++
 stubs/Makefile.objs             |    1 +
 stubs/qmp_pc_dimm_device_list.c |    7 +++++
 7 files changed, 140 insertions(+), 0 deletions(-)
 create mode 100644 stubs/qmp_pc_dimm_device_list.c

diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
index 9f091c6..361071f 100644
--- a/hw/mem/pc-dimm.c
+++ b/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;
diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
index 5f80d14..fa4cdd3 100644
--- a/include/hw/mem/pc-dimm.h
+++ b/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
diff --git a/qapi-schema.json b/qapi-schema.json
index 7bc33ea..beb2de8 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -4722,3 +4722,56 @@
               'btn'     : 'InputBtnEvent',
               'rel'     : 'InputMoveEvent',
               'abs'     : 'InputMoveEvent' } }
+
+##
+# @PCDIMMDeviceInfo:
+#
+# PCDIMMDevice state information
+#
+# @id: the device's ID
+#
+# @addr: physical address, where device is mapped
+#
+# @size: size of memory 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'] }
diff --git a/qmp-commands.hx b/qmp-commands.hx
index d8aa4ed..c0e0d9e 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -3572,3 +3572,30 @@ Example:
                    } } ] }
 
 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
diff --git a/qmp.c b/qmp.c
index b722dbe..66d2d67 100644
--- a/qmp.c
+++ b/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;
+}
diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
index d99e2b9..6a95122 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -29,3 +29,4 @@ 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
diff --git a/stubs/qmp_pc_dimm_device_list.c b/stubs/qmp_pc_dimm_device_list.c
new file mode 100644
index 0000000..5cb220c
--- /dev/null
+++ b/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;
+}
-- 
1.7.1