Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* rust: better integration with clippy, rustfmt and rustdoc
* rust: interior mutability types
* rust: add a bit operations module
* rust: first part of QOM rework
* kvm: remove unnecessary #ifdef
* clock: small cleanups, improve handling of Clock lifetimes

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# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
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* tag 'for-upstream' of https://gitlab.com/bonzini/qemu: (49 commits)
  rust: qom: change the parent type to an associated type
  rust: qom: split ObjectType from ObjectImpl trait
  rust: qom: move bridge for TypeInfo functions out of pl011
  rust: qdev: move bridge for realize and reset functions out of pl011
  rust: qdev: move device_class_init! body to generic function, ClassInitImpl implementation to macro
  rust: qom: move ClassInitImpl to the instance side
  rust: qom: convert type_info! macro to an associated const
  rust: qom: rename Class trait to ClassInitImpl
  rust: qom: add default definitions for ObjectImpl
  rust: add a bit operation module
  rust: add bindings for interrupt sources
  rust: define prelude
  rust: cell: add BQL-enforcing RefCell variant
  rust: cell: add BQL-enforcing Cell variant
  bql: check that the BQL is not dropped within marked sections
  qom/object: Remove type_register()
  script/codeconverter/qom_type_info: Deprecate MakeTypeRegisterStatic and MakeTypeRegisterNotStatic
  ui: Replace type_register() with type_register_static()
  target/xtensa: Replace type_register() with type_register_static()
  target/sparc: Replace type_register() with type_register_static()
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

2 files changed, 46 insertions, 62 deletions

diff --git a/hw/core/clock.c b/hw/core/clock.c
index cbe7b1b..391095e 100644
--- a/hw/core/clock.c
+++ b/hw/core/clock.c
@@ -44,16 +44,12 @@ Clock *clock_new(Object *parent, const char *name)
 void clock_set_callback(Clock *clk, ClockCallback *cb, void *opaque,
                         unsigned int events)
 {
+    assert(OBJECT(clk)->parent);
     clk->callback = cb;
     clk->callback_opaque = opaque;
     clk->callback_events = events;
 }
 
-void clock_clear_callback(Clock *clk)
-{
-    clock_set_callback(clk, NULL, NULL, 0);
-}
-
 bool clock_set(Clock *clk, uint64_t period)
 {
     if (clk->period == period) {
@@ -168,6 +164,16 @@ static void clock_period_prop_get(Object *obj, Visitor *v, const char *name,
     visit_type_uint64(v, name, &period, errp);
 }
 
+static void clock_unparent(Object *obj)
+{
+    /*
+     * Callback are registered by the parent, which might die anytime after
+     * it's unparented the children.  Avoid having a callback to a deleted
+     * object in case the clock is still referenced somewhere else (eg: by
+     * a clock output).
+     */
+    clock_set_callback(CLOCK(obj), NULL, NULL, 0);
+}
 
 static void clock_initfn(Object *obj)
 {
@@ -200,11 +206,17 @@ static void clock_finalizefn(Object *obj)
     g_free(clk->canonical_path);
 }
 
+static void clock_class_init(ObjectClass *klass, void *data)
+{
+    klass->unparent = clock_unparent;
+}
+
 static const TypeInfo clock_info = {
     .name              = TYPE_CLOCK,
     .parent            = TYPE_OBJECT,
     .instance_size     = sizeof(Clock),
     .instance_init     = clock_initfn,
+    .class_init        = clock_class_init,
     .instance_finalize = clock_finalizefn,
 };
 
diff --git a/hw/core/qdev-clock.c b/hw/core/qdev-clock.c
index 8279957..dacafa4 100644
--- a/hw/core/qdev-clock.c
+++ b/hw/core/qdev-clock.c
@@ -22,7 +22,7 @@
  * Add a new clock in a device
  */
 static NamedClockList *qdev_init_clocklist(DeviceState *dev, const char *name,
-                                           bool output, Clock *clk)
+                                           bool alias, bool output, Clock *clk)
 {
     NamedClockList *ncl;
 
@@ -38,39 +38,8 @@ static NamedClockList *qdev_init_clocklist(DeviceState *dev, const char *name,
      */
     ncl = g_new0(NamedClockList, 1);
     ncl->name = g_strdup(name);
+    ncl->alias = alias;
     ncl->output = output;
-    ncl->alias = (clk != NULL);
-
-    /*
-     * Trying to create a clock whose name clashes with some other
-     * clock or property is a bug in the caller and we will abort().
-     */
-    if (clk == NULL) {
-        clk = CLOCK(object_new(TYPE_CLOCK));
-        object_property_add_child(OBJECT(dev), name, OBJECT(clk));
-        if (output) {
-            /*
-             * Remove object_new()'s initial reference.
-             * Note that for inputs, the reference created by object_new()
-             * will be deleted in qdev_finalize_clocklist().
-             */
-            object_unref(OBJECT(clk));
-        }
-    } else {
-        object_property_add_link(OBJECT(dev), name,
-                                 object_get_typename(OBJECT(clk)),
-                                 (Object **) &ncl->clock,
-                                 NULL, OBJ_PROP_LINK_STRONG);
-        /*
-         * Since the link property has the OBJ_PROP_LINK_STRONG flag, the clk
-         * object reference count gets decremented on property deletion.
-         * However object_property_add_link does not increment it since it
-         * doesn't know the linked object. Increment it here to ensure the
-         * aliased clock stays alive during this device life-time.
-         */
-        object_ref(OBJECT(clk));
-    }
-
     ncl->clock = clk;
 
     QLIST_INSERT_HEAD(&dev->clocks, ncl, node);
@@ -84,14 +53,11 @@ void qdev_finalize_clocklist(DeviceState *dev)
 
     QLIST_FOREACH_SAFE(ncl, &dev->clocks, node, ncl_next) {
         QLIST_REMOVE(ncl, node);
-        if (!ncl->output && !ncl->alias) {
+        if (!ncl->alias) {
             /*
              * We kept a reference on the input clock to ensure it lives up to
-             * this point so we can safely remove the callback.
-             * It avoids having a callback to a deleted object if ncl->clock
-             * is still referenced somewhere else (eg: by a clock output).
+             * this point; it is used by the monitor to show the frequency.
              */
-            clock_clear_callback(ncl->clock);
             object_unref(OBJECT(ncl->clock));
         }
         g_free(ncl->name);
@@ -101,29 +67,25 @@ void qdev_finalize_clocklist(DeviceState *dev)
 
 Clock *qdev_init_clock_out(DeviceState *dev, const char *name)
 {
-    NamedClockList *ncl;
-
-    assert(name);
-
-    ncl = qdev_init_clocklist(dev, name, true, NULL);
+    Clock *clk = CLOCK(object_new(TYPE_CLOCK));
+    object_property_add_child(OBJECT(dev), name, OBJECT(clk));
 
-    return ncl->clock;
+    qdev_init_clocklist(dev, name, false, true, clk);
+    return clk;
 }
 
 Clock *qdev_init_clock_in(DeviceState *dev, const char *name,
                           ClockCallback *callback, void *opaque,
                           unsigned int events)
 {
-    NamedClockList *ncl;
-
-    assert(name);
-
-    ncl = qdev_init_clocklist(dev, name, false, NULL);
+    Clock *clk = CLOCK(object_new(TYPE_CLOCK));
+    object_property_add_child(OBJECT(dev), name, OBJECT(clk));
 
+    qdev_init_clocklist(dev, name, false, false, clk);
     if (callback) {
-        clock_set_callback(ncl->clock, callback, opaque, events);
+        clock_set_callback(clk, callback, opaque, events);
     }
-    return ncl->clock;
+    return clk;
 }
 
 void qdev_init_clocks(DeviceState *dev, const ClockPortInitArray clocks)
@@ -194,15 +156,25 @@ Clock *qdev_get_clock_out(DeviceState *dev, const char *name)
 Clock *qdev_alias_clock(DeviceState *dev, const char *name,
                         DeviceState *alias_dev, const char *alias_name)
 {
-    NamedClockList *ncl;
-
-    assert(name && alias_name);
+    NamedClockList *ncl = qdev_get_clocklist(dev, name);
+    Clock *clk = ncl->clock;
 
-    ncl = qdev_get_clocklist(dev, name);
+    ncl = qdev_init_clocklist(alias_dev, alias_name, true, ncl->output, clk);
 
-    qdev_init_clocklist(alias_dev, alias_name, ncl->output, ncl->clock);
+    object_property_add_link(OBJECT(alias_dev), alias_name,
+                             TYPE_CLOCK,
+                             (Object **) &ncl->clock,
+                             NULL, OBJ_PROP_LINK_STRONG);
+    /*
+     * Since the link property has the OBJ_PROP_LINK_STRONG flag, the clk
+     * object reference count gets decremented on property deletion.
+     * However object_property_add_link does not increment it since it
+     * doesn't know the linked object. Increment it here to ensure the
+     * aliased clock stays alive during this device life-time.
+     */
+    object_ref(OBJECT(clk));
 
-    return ncl->clock;
+    return clk;
 }
 
 void qdev_connect_clock_in(DeviceState *dev, const char *name, Clock *source)