diff options
| author | Michael Zoran <mzoran@crowfest.net> | 2017-01-29 23:31:09 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-31 10:48:14 +0100 |
| commit | fbcaed9e324de3c17fd57f8c8e65069c4e1eab8f (patch) | |
| tree | beb158316e33586417401fb9deddf558c3e674bc | |
| parent | 0cec463e391e05b807a5114e9f0635e4980b805e (diff) | |
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: Michael Zoran <mzoran@crowfest.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/vc04_services/interface/vchi/vchi.h | 6 | ||||
| -rw-r--r-- | drivers/staging/vc04_services/interface/vchiq_arm/vchiq_shim.c | 22 |
2 files changed, 28 insertions, 0 deletions
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 * |