static void IpcTask (void * pvParameters)
{
unsigned int msg, *local_vq_buf;
int ret;
struct virtqueue_buf virtq_buf;
virtqueue_init();
nvic_enable_irq(MAILBOX_IRQ);
enable_mailbox_irq();
for (;;) {
xQueueReceive(MboxQueue, &msg, portMAX_DELAY);
trace_printf("msg from mailbox : ");
trace_value(msg);
switch(msg) {
case RP_MBOX_ECHO_REQUEST :
mailbox_send(M3_TO_HOST_MBX, RP_MBOX_ECHO_REPLY);
break;
case HOST_TO_M3_VRING :
ret = virtqueue_get_avail_buf(&virtqueue_list[msg], &virtq_buf);
/* make a local copy of the buffer */
local_vq_buf = pvPortMalloc(RP_MSG_BUF_SIZE);
memcpy(local_vq_buf, virtq_buf.buf_ptr, RP_MSG_BUF_SIZE);
virtqueue_add_used_buf(&virtqueue_list[msg], virtq_buf.head);
/* dispatch to the service queue */
rpmsg_dispatch_msg(local_vq_buf);
break;
case M3_TO_HOST_VRING :
trace_printf("kick on vq0, dropping it \n");
xSemaphoreGive(InitDoneSemaphore);
break;
}
}
vTaskDelete(NULL);
}
static void IpcTask (void * pvParameters)
{
unsigned int msg, *local_vq_buf;
int ret;
struct virtqueue_buf virtq_buf;
portTickType LastWake;
trace_append("%s: starting task\n", __func__);
/* Workaround
*
* We can't enable interrupts in U-Boot. Let's wait until Linux is booted
* on CPU. Linux remoteproc framework sends a ping to IPU via mailbox when
* its initialization is completed. This ping is a good indicator for IPU
* that Linux and its remoteproc/rpmsg subsystems are up an running.
*/
while (1) {
msg = mailbox_read();
if (msg == HOST_ECHO_REQUEST) {
trace_append("%s: received echo request [0x%x] from CPU\n", __func__, msg);
break;
}
trace_append("%s: host-to-m3 mailbox [0x%x]\n", __func__, msg);
LastWake = xTaskGetTickCount();
vTaskDelayUntil(&LastWake, 5000);
}
virtqueue_init();
nvic_enable_irq(MAILBOX_IRQ);
enable_mailbox_irq();
trace_append("%s: start main loop\n", __func__);
for (;;) {
xQueueReceive(MboxQueue, &msg, portMAX_DELAY);
switch(msg) {
case RP_MBOX_ECHO_REQUEST :
mailbox_send(M3_TO_HOST_MBX, RP_MBOX_ECHO_REPLY);
break;
case HOST_TO_M3_VRING :
ret = virtqueue_get_avail_buf(&virtqueue_list[msg], &virtq_buf);
/* make a local copy of the buffer */
local_vq_buf = pvPortMalloc(RP_MSG_BUF_SIZE);
memcpy(local_vq_buf, virtq_buf.buf_ptr, RP_MSG_BUF_SIZE);
virtqueue_add_used_buf(&virtqueue_list[msg], virtq_buf.head);
/* dispatch to the service queue */
rpmsg_dispatch_msg(local_vq_buf);
break;
case M3_TO_HOST_VRING :
xSemaphoreGive(InitDoneSemaphore);
break;
default:
trace_append("%s: unknown message\n", __func__);
break;
}
}
vTaskDelete(NULL);
}
static long epiphany_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
int retval = 0;
int err = 0;
epiphany_alloc_t *ealloc = NULL;
mailbox_notifier_t notifier;
if (_IOC_TYPE(cmd) != EPIPHANY_IOC_MAGIC) {
return -ENOTTY;
}
if (_IOC_NR(cmd) > EPIPHANY_IOC_MAXNR) {
return -ENOTTY;
}
if (_IOC_DIR(cmd) & _IOC_READ) {
err =
!access_ok(VERIFY_READ, (void __user *)arg, _IOC_SIZE(cmd));
} else if (_IOC_DIR(cmd) & _IOC_WRITE) {
err =
!access_ok(VERIFY_WRITE, (void __user *)arg,
_IOC_SIZE(cmd));
}
if (err) {
return -EFAULT;
}
switch (cmd) {
case EPIPHANY_IOC_GETSHM:
ealloc = (epiphany_alloc_t *) (arg);
if (copy_to_user(ealloc, &global_shm, sizeof(*ealloc))) {
printk(KERN_ERR "EPIPHANY_IOC_GETSHM - failed\n");
retval = -EACCES;
}
break;
case EPIPHANY_IOC_MB_ENABLE:
enable_mailbox_irq();
break;
case EPIPHANY_IOC_MB_DISABLE:
disable_mailbox_irq();
break;
case EPIPHANY_IOC_MB_NOTIFIER:
// TODO lock access
if (copy_from_user(¬ifier, (void __user *)arg, sizeof(mailbox_notifier_t)))
{
printk(KERN_ERR "EPIPHANY_IOC_MB_NOTIFIER - failed\n");
retval = -EACCES;
}
if (notifier.old_notifier != mailbox_notifier)
{
printk(KERN_ERR "EPIPHANY_IOC_MB_NOTIFIER - %d != %d\n", notifier.old_notifier, mailbox_notifier);
retval = -EACCES;
}
else
{
// flush the queue
flush_workqueue(irq_workqueue);
mailbox_notifier = notifier.new_notifier;
}
if (0 < mailbox_notifier)
{
// Save the userspace task for later use
mailbox.irq_work.userspace_task = pid_task(find_vpid(current->pid), PIDTYPE_PID);
}
// TODO unlock
break;
default: /* Redundant, cmd was checked against MAXNR */
return -ENOTTY;
}
return retval;
}