virtio-blk: support called read/write in interrupt

Coredump need call the block read/write ops in interrupt
Not consider the ops called in thread and intterupt simultaneously.
Only used for coredump now.

Signed-off-by: Bowen Wang <wangbowen6@xiaomi.com>

drivers/virtio/virtio-blk.c

@@ -175,6 +175,38 @@ static int g_virtio_blk_idx = 0;
  * Private Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: virtio_blk_wait_complete
+ *
+ * Description:
+ *   Wait the virtio block request complete
+ *
+ ****************************************************************************/
+
+static void virtio_blk_wait_complete(FAR struct virtqueue *vq,
+                                     FAR sem_t *respsem)
+{
+  if (up_interrupt_context())
+    {
+      for (; ; )
+        {
+          FAR sem_t * tmpsem = virtqueue_get_buffer(vq, NULL, NULL);
+          if (tmpsem == respsem)
+            {
+              break;
+            }
+          else if (tmpsem != NULL)
+            {
+              nxsem_post(tmpsem);
+            }
+        }
+    }
+  else
+    {
+      nxsem_wait_uninterruptible(respsem);
+    }
+}
+
 /****************************************************************************
  * Name: virtio_blk_rdwr
  *
@@ -194,10 +226,17 @@ static ssize_t virtio_blk_rdwr(FAR struct virtio_blk_priv_s *priv,
   ssize_t ret;
   int readnum;
 
-  ret = nxmutex_lock(&priv->lock);
+  if (up_interrupt_context())
-  if (ret < 0)
     {
-      return ret;
+      virtqueue_disable_cb(vq);
+    }
+  else
+    {
+      ret = nxmutex_lock(&priv->lock);
+      if (ret < 0)
+        {
+          return ret;
+        }
     }
 
   nxsem_init(&respsem, 0, 0);
@@ -233,7 +272,8 @@ static ssize_t virtio_blk_rdwr(FAR struct virtio_blk_priv_s *priv,
 
   /* Wait for the request completion */
 
-  nxsem_wait_uninterruptible(&respsem);
+  virtio_blk_wait_complete(vq, &respsem);
+
   if (priv->resp->status != VIRTIO_BLK_S_OK)
     {
       vrterr("%s Error\n", write ? "Write" : "Read");
@@ -241,7 +281,15 @@ static ssize_t virtio_blk_rdwr(FAR struct virtio_blk_priv_s *priv,
     }
 
 err:
-  nxmutex_unlock(&priv->lock);
+  if (up_interrupt_context())
+    {
+      virtqueue_enable_cb(vq);
+    }
+  else
+    {
+      nxmutex_unlock(&priv->lock);
+    }
+
   return ret >= 0 ? nsectors : ret;
 }