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Commit fbcaed9e authored by Michael Zoran's avatar Michael Zoran Committed by Greg Kroah-Hartman
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staging: vc04_services: Add vchi_queue_kernel_message function 



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: default avatarMichael Zoran <mzoran@crowfest.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0cec463e

drivers/staging/vc04_services/interface/vchi/vchi.h

+6 −0
Original line number Diff line number Diff line
@@ -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,

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_shim.c

+22 −0
Original line number Diff line number Diff line
@@ -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

 *