[PATCH V2 1/3] staging: vc04_services: Add vchi_queue_kernel_message function

[Michael Zoran <mzoran@xxxxxxxxxxxx>]

The vchi_msg_queue function which is used by other drivers
to queue a message is difficult to understand and overly
generic.

Add a new function which is a wrapper on top of vchi_msg_queue
that is specifically for queuing a message located in kernel
address space.

int
vchi_queue_kernel_message(VCHI_SERVICE_HANDLE_T handle,
			  void *data,
			  unsigned int size)

Signed-off-by: Michael Zoran <mzoran@xxxxxxxxxxxx>
---
 .../staging/vc04_services/interface/vchi/vchi.h    |  6 ++++++
 .../vc04_services/interface/vchiq_arm/vchiq_shim.c | 22 ++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/staging/vc04_services/interface/vchi/vchi.h b/drivers/staging/vc04_services/interface/vchi/vchi.h
index 44169d6c5a36..7ab74f76f2f8 100644
--- a/drivers/staging/vc04_services/interface/vchi/vchi.h
+++ b/drivers/staging/vc04_services/interface/vchi/vchi.h
@@ -227,6 +227,12 @@ extern int32_t
 		       void *context,
 		       uint32_t data_size);
 
+/* Routine to send a message from kernel memory across a service */
+extern int
+vchi_queue_kernel_message(VCHI_SERVICE_HANDLE_T handle,
+			  void *data,
+			  unsigned int size);
+
 // Routine to receive a msg from a service
 // Dequeue is equivalent to hold, copy into client buffer, release
 extern int32_t vchi_msg_dequeue( VCHI_SERVICE_HANDLE_T handle,
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_shim.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_shim.c
index a6b2ae0c9bea..26edd6e69dcd 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_shim.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_shim.c
@@ -188,6 +188,28 @@ int32_t vchi_msg_queue(VCHI_SERVICE_HANDLE_T handle,
 }
 EXPORT_SYMBOL(vchi_msg_queue);
 
+static ssize_t
+vchi_queue_kernel_message_callback(void *context,
+				   void *dest,
+				   size_t offset,
+				   size_t maxsize)
+{
+	memcpy(dest, context + offset, maxsize);
+	return maxsize;
+}
+
+int
+vchi_queue_kernel_message(VCHI_SERVICE_HANDLE_T handle,
+			  void *data,
+			  unsigned int size)
+{
+	return vchi_msg_queue(handle,
+			      vchi_queue_kernel_message_callback,
+			      data,
+			      size);
+}
+EXPORT_SYMBOL(vchi_queue_kernel_message);
+
 /***********************************************************
  * Name: vchi_bulk_queue_receive
  *
-- 
2.11.0

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