pc-dimm: introduce realize callback

nvdimm needs to  check if the backend memory is large enough to contain
label data and init its memory region when the device is realized, so
introduce realize callback which is called after common dimm has been
realize

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
index 70b9451654bbf4de22565905b209b21e7b0aa752..6de2275986b65310dbd7386ea459646a6e656c56 100644 (file)
--- a/hw/mem/pc-dimm.c
+++ b/hw/mem/pc-dimm.c
@@ -400,6 +400,7 @@ static void pc_dimm_init(Object *obj)
 static void pc_dimm_realize(DeviceState *dev, Error **errp)
 {
     PCDIMMDevice *dimm = PC_DIMM(dev);
+    PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
 
     if (!dimm->hostmem) {
         error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property is not set");
@@ -412,6 +413,10 @@ static void pc_dimm_realize(DeviceState *dev, Error **errp)
                    dimm->node, nb_numa_nodes ? nb_numa_nodes : 1);
         return;
     }
+
+    if (ddc->realize) {
+        ddc->realize(dimm, errp);
+    }
 }
 
 static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm)

diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
index 602462716776503fbfcd880ed207b3d0b3ba45a9..67e92d8f7ba43962758f5f394565670e4d6278b6 100644 (file)
--- a/include/hw/mem/pc-dimm.h
+++ b/include/hw/mem/pc-dimm.h
@@ -58,6 +58,8 @@ typedef struct PCDIMMDevice {
 
 /**
  * PCDIMMDeviceClass:
+ * @realize: called after common dimm is realized so that the dimm based
+ * devices get the chance to do specified operations.
  * @get_memory_region: returns #MemoryRegion associated with @dimm which
  * is directly mapped into the physical address space of guest
  */
@@ -66,6 +68,7 @@ typedef struct PCDIMMDeviceClass {
     DeviceClass parent_class;
 
     /* public */
+    void (*realize)(PCDIMMDevice *dimm, Error **errp);
     MemoryRegion *(*get_memory_region)(PCDIMMDevice *dimm);
 } PCDIMMDeviceClass;