libdce[Android]: Add dce_ipc_recover API

In case of remote core recovery due to remote core crash, the rpmsg-dce
handle needs to be closed and re-opened since any handles that were
open when the crash happened are marked as stale in the driver.

This patch adds a new API that the user can call to close the rpmsg-dce
handle so that recovery can happen.

In case the user receives notification of a remote core crash, it can
call the dce_ipc_recover() API to make sure that the rpmsg-dce handle
that is opened during dce_buf_lock is closed so that a new one can
be opened the next time.

Change-Id: I8ebc19e308ffe7431b57c31cfecd469e171777f6
Signed-off-by: Angela Stegmaier <angelabaker@ti.com>

3 files changed, 18 insertions, 3 deletions

diff --git a/libdce.h b/libdce.h
index f17422e..bbc7c13 100644
--- a/libdce.h
+++ b/libdce.h
@@ -132,6 +132,12 @@ int dce_ipc_init(int core);
  */
 void dce_ipc_deinit(int core, int tableIdx);
 
+/*===============================================================*/
+/** dce_ipc_recover         : Recover the DCE IPC in case of
+ *                            remote core crash.
+ */
+void dce_ipc_recover(void);
+
 /************************ Input/Output Buffer Lock/Unlock APIs ************************/
 /*=====================================================================================*/
 /** dce_buf_lock            : Pin or lock Tiler Buffers which would be used by the IVAHD codec
diff --git a/libdce_android.c b/libdce_android.c
index de6a5c8..0c6065a 100644
--- a/libdce_android.c
+++ b/libdce_android.c
@@ -45,6 +45,7 @@
 extern MmRpc_Handle    MmRpcHandle[];
 extern pthread_mutex_t    ipc_mutex;
 int is_ipc_ready = 0;
+static int dce_buf_count = 0;
 
 int dce_buf_lock(int num, size_t *handle)
 {
@@ -113,4 +114,10 @@ EXIT:
     return (eError);
 }
 
-
+void dce_ipc_recover(void)
+{
+    if (is_ipc_ready) {
+        dce_ipc_deinit(IPU, -1);
+        is_ipc_ready = 0;
+    }
+}
diff --git a/memplugin_android.c b/memplugin_android.c
index 22a5564..b140aa5 100644
--- a/memplugin_android.c
+++ b/memplugin_android.c
@@ -99,8 +99,10 @@ int memplugin_close()
     /*Acquire permission to use IPC*/
     pthread_mutex_lock(&ipc_mutex);
 
-    dce_ipc_deinit(IPU, -1);
-    is_ipc_ready = 0;
+    if (is_ipc_ready) {
+        dce_ipc_deinit(IPU, -1);
+        is_ipc_ready = 0;
+    }
 
     /*Relinquish IPC*/
     pthread_mutex_unlock(&ipc_mutex);