[Qemu-devel] [PATCH 1/4] qdev: device capabilities

[Gerd Hoffmann <kraxel@redhat.com>]

This patch adds device capabilities to qdev devices.  This is the
core code, following patches will add the individual capabilities
and tag drivers.

The capabilities will be printed by '-device ?' and 'info qdm", so
users and management apps can use it.

Future plans:  I plan to use them to get rid off some hard-coded
lists in qemu by using capabilities instead: pci nic list, watchdog
list, maybe more.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/qdev.c |   19 ++++++++++++++++++-
 hw/qdev.h |    5 +++++
 2 files changed, 23 insertions(+), 1 deletions(-)

diff --git a/hw/qdev.c b/hw/qdev.c
index c1a7779..568d249 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -107,8 +107,11 @@ DeviceState *qdev_create(BusState *bus, const char *name)
 
 static int qdev_print_devinfo(DeviceInfo *info, char *dest, int len)
 {
+    static const char *capname[] = {
+    };
+    const char *sep;
     int pos = 0;
-    int ret;
+    int ret,i;
 
     ret = snprintf(dest+pos, len-pos, "name \"%s\", bus %s",
                    info->name, info->bus_info->name);
@@ -125,6 +128,20 @@ static int qdev_print_devinfo(DeviceInfo *info, char *dest, int len)
         ret = snprintf(dest+pos, len-pos, ", no-user");
         pos += MIN(len-pos,ret);
     }
+    if (info->caps) {
+        ret = snprintf(dest+pos, len-pos, ", caps \"");
+        pos += MIN(len-pos,ret);
+        sep = "";
+        for (i = 0; i < ARRAY_SIZE(capname); i++) {
+            if (!(info->caps & (1 << i)))
+                continue;
+            ret = snprintf(dest+pos, len-pos, "%s%s", sep, capname[i]);
+            pos += MIN(len-pos,ret);
+            sep = ",";
+        }
+        ret = snprintf(dest+pos, len-pos, "\"");
+        pos += MIN(len-pos,ret);
+    }
     return pos;
 }
 
diff --git a/hw/qdev.h b/hw/qdev.h
index 204c4e5..7beb756 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -102,6 +102,10 @@ typedef void (*qdev_initfn)(DeviceState *dev, DeviceInfo *info);
 typedef void (*SCSIAttachFn)(DeviceState *host, BlockDriverState *bdrv,
               int unit);
 
+enum DeviceCapBits {
+    dummy
+};
+
 struct DeviceInfo {
     const char *name;
     const char *alias;
@@ -109,6 +113,7 @@ struct DeviceInfo {
     size_t size;
     Property *props;
     int no_user;
+    uint32_t caps;
 
     /* Private to qdev / bus.  */
     qdev_initfn init;
-- 
1.6.2.5