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staging: vc04_services: Add vchi_queue_user_message function

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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 user
address space.

int
vchi_queue_user_message(VCHI_SERVICE_HANDLE_T handle,
                        void __user *data,
                        unsigned int size)

Signed-off-by: Michael Zoran <mzoran@crowfest.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Zoran 2017-01-29 23:31:10 -08:00 committed by Greg Kroah-Hartman
parent fbcaed9e32
commit 619969770f
2 changed files with 40 additions and 0 deletions
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6
drivers/staging/vc04_services/interface/vchi/vchi.h
View File

@ -233,6 +233,12 @@ vchi_queue_kernel_message(VCHI_SERVICE_HANDLE_T handle,
void *data,
unsigned int size);
/* Routine to send a message from user memory across a service */
extern int
vchi_queue_user_message(VCHI_SERVICE_HANDLE_T handle,
void __user *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,

34
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_shim.c
View File

@ -210,6 +210,40 @@ vchi_queue_kernel_message(VCHI_SERVICE_HANDLE_T handle,
}
EXPORT_SYMBOL(vchi_queue_kernel_message);
struct vchi_queue_user_message_context {
void __user *data;
};
static ssize_t
vchi_queue_user_message_callback(void *context,
void *dest,
size_t offset,
size_t maxsize)
{
struct vchi_queue_user_message_context *copycontext = context;
if (copy_from_user(dest, copycontext->data + offset, maxsize))
return -EFAULT;
return maxsize;
}
int
vchi_queue_user_message(VCHI_SERVICE_HANDLE_T handle,
void __user *data,
unsigned int size)
{
struct vchi_queue_user_message_context copycontext = {
.data = data
};
return vchi_msg_queue(handle,
vchi_queue_user_message_callback,
&copycontext,
size);
}
EXPORT_SYMBOL(vchi_queue_user_message);
/***********************************************************
* Name: vchi_bulk_queue_receive
*