[Qemu-devel] [RESEND PATCH v8 2/4] hw: add a wrapper for registering reset handler

[Zhu Guihua]

Add a wrapper to specify reset order when registering reset handler,
instead of non-obvious initiazation code ordering.

Signed-off-by: Zhu Guihua <zhugh.f...@cn.fujitsu.com>
---
 include/hw/hw.h |  4 ++++
 vl.c            | 18 +++++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/include/hw/hw.h b/include/hw/hw.h
index c78adae..d9375e7 100644
--- a/include/hw/hw.h
+++ b/include/hw/hw.h
@@ -37,7 +37,11 @@
 #endif
 
 typedef void QEMUResetHandler(void *opaque);
+typedef uint64_t QEMUResetOrder;
+#define default_reset_order 0x0
 
+void qemu_register_reset_common(QEMUResetHandler *func, void *opaque,
+                                QEMUResetOrder reset_order);
 void qemu_register_reset(QEMUResetHandler *func, void *opaque);
 void qemu_unregister_reset(QEMUResetHandler *func, void *opaque);
 
diff --git a/vl.c b/vl.c
index 69ad90c..b205a9b 100644
--- a/vl.c
+++ b/vl.c
@@ -1589,6 +1589,7 @@ typedef struct QEMUResetEntry {
     QTAILQ_ENTRY(QEMUResetEntry) entry;
     QEMUResetHandler *func;
     void *opaque;
+    QEMUResetOrder reset_order;
 } QEMUResetEntry;
 
 static QTAILQ_HEAD(reset_handlers, QEMUResetEntry) reset_handlers =
@@ -1672,15 +1673,30 @@ static int qemu_debug_requested(void)
     return r;
 }
 
-void qemu_register_reset(QEMUResetHandler *func, void *opaque)
+void qemu_register_reset_common(QEMUResetHandler *func, void *opaque,
+                                QEMUResetOrder reset_order)
 {
+    QEMUResetEntry *item;
     QEMUResetEntry *re = g_malloc0(sizeof(QEMUResetEntry));
 
     re->func = func;
     re->opaque = opaque;
+    re->reset_order = reset_order;
+
+    QTAILQ_FOREACH(item, &reset_handlers, entry) {
+        if (re->reset_order >= item->reset_order)
+            continue;
+        QTAILQ_INSERT_BEFORE(item, re, entry);
+        return;
+    }
     QTAILQ_INSERT_TAIL(&reset_handlers, re, entry);
 }
 
+void qemu_register_reset(QEMUResetHandler *func, void *opaque)
+{
+    qemu_register_reset_common(func, opaque, default_reset_order);
+}
+
 void qemu_unregister_reset(QEMUResetHandler *func, void *opaque)
 {
     QEMUResetEntry *re;
-- 
1.9.3