qdev: Introduce FWPathProvider interface

QEMU supports firmware names for all devices in the QEMU tree but
some architectures expect some parts of firmware path names in different
format.

This introduces a firmware-pathname-change interface definition.
If some machines needs to redefine the firmware path format, it has
to add the TYPE_FW_PATH_PROVIDER interface to an object that is above
the device on the QOM tree (typically /machine).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Andreas Färber <afaerber@suse.de>

1 files changed, 47 insertions, 0 deletions

diff --git a/include/hw/fw-path-provider.h b/include/hw/fw-path-provider.h
new file mode 100644
index 0000000000..301834972c
--- /dev/null
+++ b/include/hw/fw-path-provider.h
@@ -0,0 +1,47 @@
+/*
+ *  Firmware patch provider class and helpers definitions.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; under version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef FW_PATH_PROVIDER_H
+#define FW_PATH_PROVIDER_H 1
+
+#include "qemu-common.h"
+#include "qom/object.h"
+
+#define TYPE_FW_PATH_PROVIDER "fw-path-provider"
+
+#define FW_PATH_PROVIDER_CLASS(klass) \
+     OBJECT_CLASS_CHECK(FWPathProviderClass, (klass), TYPE_FW_PATH_PROVIDER)
+#define FW_PATH_PROVIDER_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(FWPathProviderClass, (obj), TYPE_FW_PATH_PROVIDER)
+#define FW_PATH_PROVIDER(obj) \
+     INTERFACE_CHECK(FWPathProvider, (obj), TYPE_FW_PATH_PROVIDER)
+
+typedef struct FWPathProvider {
+    Object parent_obj;
+} FWPathProvider;
+
+typedef struct FWPathProviderClass {
+    InterfaceClass parent_class;
+
+    char *(*get_dev_path)(FWPathProvider *p, BusState *bus, DeviceState *dev);
+} FWPathProviderClass;
+
+char *fw_path_provider_get_dev_path(FWPathProvider *p, BusState *bus,
+                                    DeviceState *dev);
+char *fw_path_provider_try_get_dev_path(Object *o, BusState *bus,
+                                        DeviceState *dev);
+
+#endif /* FW_PATH_PROVIDER_H */