[RFC 1/4] memory: add memory_region_init_io_with_dev interface

[Li Qiang]

Currently the MR is not explicitly connecting with its device instead of
a opaque. In most situation this opaque is the deivce but it is not an
enforcement. This patch adds a DeviceState member of to MemoryRegion
we will use it in later patch.

Signed-off-by: Li Qiang <liq3ea@163.com>
---
 include/exec/memory.h |  9 +++++++++
 softmmu/memory.c      | 15 +++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 0cfe987ab4..620fb12d9b 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -404,6 +404,7 @@ struct MemoryRegion {
     const char *name;
     unsigned ioeventfd_nb;
     MemoryRegionIoeventfd *ioeventfds;
+    DeviceState *dev;
 };
 
 struct IOMMUMemoryRegion {
@@ -794,6 +795,14 @@ void memory_region_init_io(MemoryRegion *mr,
                            const char *name,
                            uint64_t size);
 
+void memory_region_init_io_with_dev(MemoryRegion *mr,
+                           struct Object *owner,
+                           const MemoryRegionOps *ops,
+                           void *opaque,
+                           const char *name,
+                           uint64_t size,
+                           DeviceState *dev);
+
 /**
  * memory_region_init_ram_nomigrate:  Initialize RAM memory region.  Accesses
  *                                    into the region will modify memory
diff --git a/softmmu/memory.c b/softmmu/memory.c
index 70b93104e8..2628c9d2d9 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1490,6 +1490,21 @@ void memory_region_init_io(MemoryRegion *mr,
     mr->terminates = true;
 }
 
+void memory_region_init_io_with_dev(MemoryRegion *mr,
+                           Object *owner,
+                           const MemoryRegionOps *ops,
+                           void *opaque,
+                           const char *name,
+                           uint64_t size,
+                           DeviceState *dev)
+{
+    memory_region_init(mr, owner, name, size);
+    mr->ops = ops ? ops : &unassigned_mem_ops;
+    mr->opaque = opaque;
+    mr->terminates = true;
+    mr->dev = dev;
+}
+
 void memory_region_init_ram_nomigrate(MemoryRegion *mr,
                                       Object *owner,
                                       const char *name,
-- 
2.17.1