/**
* rpmsg_virtio_get_tx_buffer
*
* Provides buffer to transmit messages.
*
* @param rvdev - pointer to rpmsg device
* @param len - length of returned buffer
* @param idx - buffer index
*
* return - pointer to buffer.
*/
static void *rpmsg_virtio_get_tx_buffer(struct rpmsg_virtio_device *rvdev,
uint32_t *len, uint16_t *idx)
{
unsigned int role = rpmsg_virtio_get_role(rvdev);
void *data = NULL;
#ifndef VIRTIO_SLAVE_ONLY
if (role == RPMSG_MASTER) {
data = virtqueue_get_buffer(rvdev->svq, len, idx);
if (data == NULL) {
data = rpmsg_virtio_shm_pool_get_buffer(rvdev->shpool,
RPMSG_BUFFER_SIZE);
*len = RPMSG_BUFFER_SIZE;
}
}
#endif /*!VIRTIO_SLAVE_ONLY*/
#ifndef VIRTIO_MASTER_ONLY
if (role == RPMSG_REMOTE) {
data = virtqueue_get_available_buffer(rvdev->svq, idx, len);
}
#endif /*!VIRTIO_MASTER_ONLY*/
return data;
}
/**
* rpmsg_get_rx_buffer
*
* Retrieves the received buffer from the virtqueue.
*
* @param rdev - pointer to remote device
* @param len - size of received buffer
* @param idx - index of buffer
*
* @return - pointer to received buffer
*
*/
void *rpmsg_get_rx_buffer(struct remote_device *rdev, unsigned long *len,
unsigned short *idx) {
void *data;
if (rdev->role == RPMSG_REMOTE) {
data = virtqueue_get_buffer(rdev->rvq, len);
} else {
data = virtqueue_get_available_buffer(rdev->rvq, idx, len);
}
return ((void *) env_map_vatopa(data));
}
/**
* rpmsg_get_tx_buffer
*
* Provides buffer to transmit messages.
*
* @param rdev - pointer to remote device
* @param len - length of returned buffer
* @param idx - buffer index
*
* return - pointer to buffer.
*/
void *rpmsg_get_tx_buffer(struct remote_device *rdev, int *len,
unsigned short *idx) {
void *data;
if (rdev->role == RPMSG_REMOTE) {
data = virtqueue_get_buffer(rdev->tvq, (unsigned long *) len);
if (data == RPMSG_NULL) {
data = sh_mem_get_buffer(rdev->mem_pool);
*len = RPMSG_BUFFER_SIZE;
}
} else {
data = virtqueue_get_available_buffer(rdev->tvq, idx,
(unsigned long *) len);
}
return ((void *) env_map_vatopa(data));
}