qdev/prop: add drive property.

Adds a (host) drive property, intended to be used by virtual disk
backend drivers.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
Message-Id: 

hw/qdev-properties.c

+#include "sysemu.h"
 #include "qdev.h"
 
 void *qdev_get_prop_ptr(DeviceState *dev, Property *prop)
@@ -141,6 +142,32 @@ PropertyInfo qdev_prop_hex64 = {
     .print = print_hex64,
 };
 
+/* --- drive --- */
+
+static int parse_drive(DeviceState *dev, Property *prop, const char *str)
+{
+    DriveInfo **ptr = qdev_get_prop_ptr(dev, prop);
+
+    *ptr = drive_get_by_id(str);
+    if (*ptr == NULL)
+        return -1;
+    return 0;
+}
+
+static int print_drive(DeviceState *dev, Property *prop, char *dest, size_t len)
+{
+    DriveInfo **ptr = qdev_get_prop_ptr(dev, prop);
+    return snprintf(dest, len, "%s", (*ptr)->id);
+}
+
+PropertyInfo qdev_prop_drive = {
+    .name  = "drive",
+    .type  = PROP_TYPE_DRIVE,
+    .size  = sizeof(DriveInfo*),
+    .parse = parse_drive,
+    .print = print_drive,
+};
+
 /* --- pointer --- */
 
 static int print_ptr(DeviceState *dev, Property *prop, char *dest, size_t len)
@@ -325,6 +352,11 @@ void qdev_prop_set_uint64(DeviceState *dev, const char *name, uint64_t value)
     qdev_prop_set(dev, name, &value, PROP_TYPE_UINT64);
 }
 
+void qdev_prop_set_drive(DeviceState *dev, const char *name, DriveInfo *value)
+{
+    qdev_prop_set(dev, name, &value, PROP_TYPE_DRIVE);
+}
+
 void qdev_prop_set_ptr(DeviceState *dev, const char *name, void *value)
 {
     qdev_prop_set(dev, name, &value, PROP_TYPE_PTR);

hw/qdev.h

@@ -2,6 +2,7 @@
 #define QDEV_H
 
 #include "hw.h"
+#include "sysemu.h"
 #include "sys-queue.h"
 #include "qemu-option.h"
 
@@ -63,6 +64,7 @@ enum PropertyType {
     PROP_TYPE_UINT64,
     PROP_TYPE_TADDR,
     PROP_TYPE_MACADDR,
+    PROP_TYPE_DRIVE,
     PROP_TYPE_PTR,
 };
 
@@ -155,6 +157,7 @@ extern PropertyInfo qdev_prop_hex32;
 extern PropertyInfo qdev_prop_hex64;
 extern PropertyInfo qdev_prop_ptr;
 extern PropertyInfo qdev_prop_macaddr;
+extern PropertyInfo qdev_prop_drive;
 extern PropertyInfo qdev_prop_pci_devfn;
 
 /* Set properties between creation and init.  */
@@ -164,6 +167,7 @@ void qdev_prop_set(DeviceState *dev, const char *name, void *src, enum PropertyT
 void qdev_prop_set_uint16(DeviceState *dev, const char *name, uint16_t value);
 void qdev_prop_set_uint32(DeviceState *dev, const char *name, uint32_t value);
 void qdev_prop_set_uint64(DeviceState *dev, const char *name, uint64_t value);
+void qdev_prop_set_drive(DeviceState *dev, const char *name, DriveInfo *value);
 /* FIXME: Remove opaque pointer properties.  */
 void qdev_prop_set_ptr(DeviceState *dev, const char *name, void *value);
 void qdev_prop_set_defaults(DeviceState *dev, Property *props);