[PATCH v5 08/13] hw/core: deprecate old reset functions and introduce new ones

[Damien Hedde <damien.hedde@greensocs.com>]

Deprecate device_legacy_reset(), qdev_reset_all() and
qbus_reset_all() to be replaced by new functions
device_cold_reset() and bus_cold_reset() which uses resettable API.

Also introduce resettable_cold_reset_fn() which may be used as a
replacement for qdev_reset_all_fn and qbus_reset_all_fn().

Following patches will be needed to look at legacy reset call sites
and switch to resettable api. The legacy functions will be removed
when unused.

Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
---

I've removed the general helpers
+ device_reset(DeviceState *dev, ResetType type)
+ bus_reset(BusState *dev, ResetType type)
because with several reset types, all devices and buses will not
implement all of them. I think it is preferable to define a
type-specific helper every time it is needed for base classes
implementing the reset type (eg a device_pci_reset(PciDev*) for the
pci reset type if add that).

So device_reset()/bus_reset() symbol names are not taken anymore. I
don't have a strong opinion of what names should have the
device_cold_reset() and bus_cold_reset() function added in this
patch. It could be device/bus_hard_reset() (the current
qbus_reset_all() comment mention we do a "hard" reset) or simply
device/bus_reset() or anything else.
What do you think ? Any better idea ? It should be consistent with
the reset type name but we can change it also if cold is not what we
want.

Note that if we don't settle for device/bus_reset(). We can drop
the first patch that renames device_reset() to device_legacy_reset()
---
 hw/core/bus.c           |  5 +++++
 hw/core/qdev.c          |  5 +++++
 hw/core/resettable.c    |  5 +++++
 include/hw/qdev-core.h  | 27 +++++++++++++++++++++++++++
 include/hw/resettable.h |  9 +++++++++
 5 files changed, 51 insertions(+)

diff --git a/hw/core/bus.c b/hw/core/bus.c
index 7c05e80db8..5f9e261bb2 100644
--- a/hw/core/bus.c
+++ b/hw/core/bus.c
@@ -68,6 +68,11 @@ int qbus_walk_children(BusState *bus,
     return 0;
 }
 
+void bus_cold_reset(BusState *bus)
+{
+    resettable_reset(OBJECT(bus), RESET_TYPE_COLD);
+}
+
 bool bus_is_in_reset(BusState *bus)
 {
     return resettable_is_in_reset(OBJECT(bus));
diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index c5d107ea4e..3e6600ce76 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -335,6 +335,11 @@ void qbus_reset_all_fn(void *opaque)
     qbus_reset_all(bus);
 }
 
+void device_cold_reset(DeviceState *dev)
+{
+    resettable_reset(OBJECT(dev), RESET_TYPE_COLD);
+}
+
 bool device_is_in_reset(DeviceState *dev)
 {
     return resettable_is_in_reset(OBJECT(dev));
diff --git a/hw/core/resettable.c b/hw/core/resettable.c
index 60d4285fcc..3d3200bdbc 100644
--- a/hw/core/resettable.c
+++ b/hw/core/resettable.c
@@ -252,6 +252,11 @@ void resettable_change_parent(Object *obj, Object *newp, Object *oldp)
     }
 }
 
+void resettable_cold_reset_fn(void *opaque)
+{
+    resettable_reset((Object *) opaque, RESET_TYPE_COLD);
+}
+
 void resettable_class_set_parent_phases(ResettableClass *rc,
                                         ResettableEnterPhase enter,
                                         ResettableHoldPhase hold,
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 2e3346600e..1e88cb2f6a 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -386,6 +386,13 @@ int qdev_walk_children(DeviceState *dev,
                        qdev_walkerfn *post_devfn, qbus_walkerfn *post_busfn,
                        void *opaque);
 
+/**
+ * @qdev_reset_all:
+ * Reset @dev. See @qbus_reset_all() for more details.
+ *
+ * Note: This function is deprecated and will be removed when it becomes unused.
+ * Please use device_cold_reset() now.
+ */
 void qdev_reset_all(DeviceState *dev);
 void qdev_reset_all_fn(void *opaque);
 
@@ -398,10 +405,28 @@ void qdev_reset_all_fn(void *opaque);
  * hard reset means that qbus_reset_all will reset all state of the device.
  * For PCI devices, for example, this will include the base address registers
  * or configuration space.
+ *
+ * Note: This function is deprecated and will be removed when it becomes unused.
+ * Please use bus_cold_reset() now.
  */
 void qbus_reset_all(BusState *bus);
 void qbus_reset_all_fn(void *opaque);
 
+/**
+ * device_cold_reset:
+ * Reset device @dev and perform a recursive processing using the resettable
+ * interface. It triggers a RESET_TYPE_COLD.
+ */
+void device_cold_reset(DeviceState *dev);
+
+/**
+ * bus_cold_reset:
+ *
+ * Reset bus @bus and perform a recursive processing using the resettable
+ * interface. It triggers a RESET_TYPE_COLD.
+ */
+void bus_cold_reset(BusState *bus);
+
 /**
  * device_is_in_reset:
  * Return true if the device @dev is currently being reset.
@@ -432,6 +457,8 @@ void qdev_machine_init(void);
  * device_legacy_reset:
  *
  * Reset a single device (by calling the reset method).
+ * Note: This function is deprecated and will be removed when it becomes unused.
+ * Please use device_cold_reset() now.
  */
 void device_legacy_reset(DeviceState *dev);
 
diff --git a/include/hw/resettable.h b/include/hw/resettable.h
index f6d379669f..6a9e17344e 100644
--- a/include/hw/resettable.h
+++ b/include/hw/resettable.h
@@ -198,6 +198,15 @@ bool resettable_is_in_reset(Object *obj);
  */
 void resettable_change_parent(Object *obj, Object *newp, Object *oldp);
 
+/**
+ * resettable_cold_reset_fn:
+ * Helper to call resettable_reset((Object *) opaque, RESET_TYPE_COLD).
+ *
+ * This function is typically useful to register a reset handler with
+ * qemu_register_reset.
+ */
+void resettable_cold_reset_fn(void *opaque);
+
 /**
  * resettable_class_set_parent_phases:
  *
-- 
2.23.0