[Qemu-devel] [PATCH 2/5] machine: introduce get_fw_dev_path() callback

[Alexey Kardashevskiy <aik@ozlabs.ru>]

QEMU supports firmware names for all devices in the QEMU tree but
sometime the exact format differs from what sPAPR platform uses.

This introduces a callback to let a machine fix device tree path names.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
 hw/core/qdev.c      | 15 ++++++++++++++-
 include/hw/boards.h |  1 +
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index e374a93..7347483 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -26,6 +26,7 @@
    this API directly.  */
 
 #include "hw/qdev.h"
+#include "hw/boards.h"
 #include "sysemu/sysemu.h"
 #include "qapi/error.h"
 #include "qapi/qmp/qerror.h"
@@ -497,6 +498,15 @@ static char *bus_get_fw_dev_path(BusState *bus, DeviceState *dev)
     return NULL;
 }
 
+static char *machine_get_fw_dev_path(BusState *bus, DeviceState *dev)
+{
+    if (current_machine->get_fw_dev_path) {
+        return current_machine->get_fw_dev_path(bus, dev);
+    }
+
+    return NULL;
+}
+
 static int qdev_get_fw_dev_path_helper(DeviceState *dev, char *p, int size)
 {
     int l = 0;
@@ -504,7 +514,10 @@ static int qdev_get_fw_dev_path_helper(DeviceState *dev, char *p, int size)
     if (dev && dev->parent_bus) {
         char *d;
         l = qdev_get_fw_dev_path_helper(dev->parent_bus->parent, p, size);
-        d = bus_get_fw_dev_path(dev->parent_bus, dev);
+        d = machine_get_fw_dev_path(dev->parent_bus, dev);
+        if (!d) {
+            d = bus_get_fw_dev_path(dev->parent_bus, dev);
+        }
         if (d) {
             l += snprintf(p + l, size - l, "%s", d);
             g_free(d);
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 5a7ae9f..50ff24a 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -43,6 +43,7 @@ typedef struct QEMUMachine {
     GlobalProperty *compat_props;
     struct QEMUMachine *next;
     const char *hw_version;
+    char *(*get_fw_dev_path)(BusState *bus, DeviceState *dev);
 } QEMUMachine;
 
 int qemu_register_machine(QEMUMachine *m);
-- 
1.8.4.rc4