[Qemu-devel] [PATCH v2 6/7] qmp: print descriptions of object properties

[arei.gonglei]

From: Gonglei <address@hidden>

The descriptions can serve as documentation in the code,
and they can be used to provide better help. For example:

$./qemu-system-x86_64 -device virtio-blk-pci,?

Before this patch:

virtio-blk-pci.iothread=link<iothread>
virtio-blk-pci.x-data-plane=bool
virtio-blk-pci.scsi=bool
virtio-blk-pci.config-wce=bool
virtio-blk-pci.serial=str
virtio-blk-pci.secs=uint32
virtio-blk-pci.heads=uint32
virtio-blk-pci.cyls=uint32
virtio-blk-pci.discard_granularity=uint32
virtio-blk-pci.bootindex=int32
virtio-blk-pci.opt_io_size=uint32
virtio-blk-pci.min_io_size=uint16
virtio-blk-pci.physical_block_size=uint16
virtio-blk-pci.logical_block_size=uint16
virtio-blk-pci.drive=str
virtio-blk-pci.virtio-backend=child<virtio-blk-device>
virtio-blk-pci.command_serr_enable=on/off
virtio-blk-pci.multifunction=on/off
virtio-blk-pci.rombar=uint32
virtio-blk-pci.romfile=str
virtio-blk-pci.addr=pci-devfn
virtio-blk-pci.event_idx=on/off
virtio-blk-pci.indirect_desc=on/off
virtio-blk-pci.vectors=uint32
virtio-blk-pci.ioeventfd=on/off
virtio-blk-pci.class=uint32

After:

virtio-blk-pci.iothread=link<iothread>
virtio-blk-pci.x-data-plane=bool (on/off)
virtio-blk-pci.scsi=bool (on/off)
virtio-blk-pci.config-wce=bool (on/off)
virtio-blk-pci.serial=str
virtio-blk-pci.secs=uint32
virtio-blk-pci.heads=uint32
virtio-blk-pci.cyls=uint32
virtio-blk-pci.discard_granularity=uint32
virtio-blk-pci.bootindex=int32
virtio-blk-pci.opt_io_size=uint32
virtio-blk-pci.min_io_size=uint16
virtio-blk-pci.physical_block_size=uint16 (A power of two between 512 and 32768)
virtio-blk-pci.logical_block_size=uint16 (A power of two between 512 and 32768)
virtio-blk-pci.drive=str (ID of a drive to use as a backend)
virtio-blk-pci.virtio-backend=child<virtio-blk-device>
virtio-blk-pci.command_serr_enable=bool (on/off)
virtio-blk-pci.multifunction=bool (on/off)
virtio-blk-pci.rombar=uint32
virtio-blk-pci.romfile=str
virtio-blk-pci.addr=int32 (Slot and function number, example: 06.0)
virtio-blk-pci.event_idx=bool (on/off)
virtio-blk-pci.indirect_desc=bool (on/off)
virtio-blk-pci.vectors=uint32
virtio-blk-pci.ioeventfd=bool (on/off)
virtio-blk-pci.class=uint32

Cc: Paolo Bonzini <address@hidden>
Cc: Michael S. Tsirkin <address@hidden>
Cc: Markus Armbruster <address@hidden>
Signed-off-by: Gonglei <address@hidden>
---
 qmp.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/qmp.c b/qmp.c
index c6767c4..20f501b 100644
--- a/qmp.c
+++ b/qmp.c
@@ -442,7 +442,8 @@ ObjectTypeInfoList *qmp_qom_list_types(bool has_implements,
  */
 static DevicePropertyInfo *make_device_property_info(ObjectClass *klass,
                                                      const char *name,
-                                                     const char *default_type)
+                                                     const char *default_type,
+                                                     const char *description)
 {
     DevicePropertyInfo *info;
     Property *prop;
@@ -465,7 +466,12 @@ static DevicePropertyInfo 
*make_device_property_info(ObjectClass *klass,
 
             info = g_malloc0(sizeof(*info));
             info->name = g_strdup(prop->name);
-            info->type = g_strdup(prop->info->legacy_name ?: prop->info->name);
+            if (prop->info->description) {
+                info->type = g_strdup_printf("%s (%s)", prop->info->name,
+                                             prop->info->description);
+            } else {
+                info->type = g_strdup(prop->info->name);
+            }
             return info;
         }
         klass = object_class_get_parent(klass);
@@ -474,7 +480,11 @@ static DevicePropertyInfo 
*make_device_property_info(ObjectClass *klass,
     /* Not a qdev property, use the default type */
     info = g_malloc0(sizeof(*info));
     info->name = g_strdup(name);
-    info->type = g_strdup(default_type);
+    if (description) {
+        info->type = g_strdup_printf("%s (%s)", default_type, description);
+    } else {
+        info->type = g_strdup(default_type);
+    }
     return info;
 }
 
@@ -521,7 +531,8 @@ DevicePropertyInfoList *qmp_device_list_properties(const 
char *typename,
             continue;
         }
 
-        info = make_device_property_info(klass, prop->name, prop->type);
+        info = make_device_property_info(klass, prop->name, prop->type,
+                                         prop->description);
         if (!info) {
             continue;
         }
-- 
1.7.12.4