[Qemu-devel] [PATCH v6] qdev: Add support for property type bool

["Andreas Färber" <afaerber@suse.de>]

From: Andreas Färber <andreas.faerber@web.de>

VMState supports the type bool but qdev instead supports bit, backed by
uint32_t. Therefore let's add DEFINE_PROP_BOOL() and qdev_prop_set_bool().

bool by definition is either true or false. Should the need arise to
parse yes/no, on/off, 1/0 or whatever as well, we can still add that at
a later point in time.

Signed-off-by: Andreas Färber <andreas.faerber@web.de>
Cc: Juan Quintela <quintela@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>
---
 v5 -> v6:
 * Rebased onto QOM properties.
 * Parse and print true/false for bool, leave bit untouched.
 Please review, v6 untested.

 v4 -> v5 (40P):
 * Parse on/off in addition to yes/no for both bit and bool, print yes/no for bool.

 v4 (ISA):
 * Introduced.

 hw/qdev-properties.c |   62 ++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/qdev.h            |    4 +++
 2 files changed, 66 insertions(+), 0 deletions(-)

diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
index 02f0dae..612f2ea 100644
--- a/hw/qdev-properties.c
+++ b/hw/qdev-properties.c
@@ -96,6 +96,68 @@ PropertyInfo qdev_prop_bit = {
     .set   = set_bit,
 };
 
+/* --- bool --- */
+
+static int parse_bool(DeviceState *dev, Property *prop, const char *str)
+{
+    bool *ptr = qdev_get_prop_ptr(dev, prop);
+    if (strcmp(str, "true") == 0) {
+        *ptr = true;
+    } else if (strcmp(str, "false") == 0) {
+        *ptr = false;
+    } else {
+        return -EINVAL;
+    }
+
+    return 0;
+}
+
+static int print_bool(DeviceState *dev, Property *prop, char *dest, size_t len)
+{
+    bool *ptr = qdev_get_prop_ptr(dev, prop);
+    return snprintf(dest, len, *ptr ? "true" : "false");
+}
+
+static void get_bool(DeviceState *dev, Visitor *v, void *opaque,
+                     const char *name, Error **errp)
+{
+    Property *prop = opaque;
+    bool *ptr = qdev_get_prop_ptr(dev, prop);
+
+    visit_type_bool(v, ptr, name, errp);
+}
+
+static void set_bool(DeviceState *dev, Visitor *v, void *opaque,
+                     const char *name, Error **errp)
+{
+    Property *prop = opaque;
+    bool *ptr = qdev_get_prop_ptr(dev, prop);
+    Error *local_err = NULL;
+    bool value;
+
+    if (dev->state != DEV_STATE_CREATED) {
+        error_set(errp, QERR_PERMISSION_DENIED);
+        return;
+    }
+
+    visit_type_bool(v, &value, name, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+    *ptr = value;
+}
+
+PropertyInfo qdev_prop_bool = {
+    .name = "bool",
+    .type = PROP_TYPE_BOOL,
+    .size = sizeof(bool),
+    .parse = parse_bool,
+    .print = print_bool,
+    .get   = get_bool,
+    .set   = set_bool,
+};
+
 /* --- 8bit integer --- */
 
 static int parse_uint8(DeviceState *dev, Property *prop, const char *str)
diff --git a/hw/qdev.h b/hw/qdev.h
index 6b58dd8..5e34d90 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -152,6 +152,7 @@ enum PropertyType {
     PROP_TYPE_VLAN,
     PROP_TYPE_PTR,
     PROP_TYPE_BIT,
+    PROP_TYPE_BOOL,
 };
 
 struct PropertyInfo {
@@ -276,6 +277,7 @@ int do_device_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
 /*** qdev-properties.c ***/
 
 extern PropertyInfo qdev_prop_bit;
+extern PropertyInfo qdev_prop_bool;
 extern PropertyInfo qdev_prop_uint8;
 extern PropertyInfo qdev_prop_uint16;
 extern PropertyInfo qdev_prop_uint32;
@@ -315,6 +317,8 @@ extern PropertyInfo qdev_prop_pci_devfn;
         .defval    = (bool[]) { (_defval) },                     \
         }
 
+#define DEFINE_PROP_BOOL(_n, _s, _f, _d)                        \
+    DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_bool, bool)
 #define DEFINE_PROP_UINT8(_n, _s, _f, _d)                       \
     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint8, uint8_t)
 #define DEFINE_PROP_UINT16(_n, _s, _f, _d)                      \
-- 
1.7.7