/* Incoming XPMEM command from enclave - enqueue and wake up kthread */
static void
xpmem_ctrl_handler(u8 * data,
u32 data_len,
void * priv_data)
{
struct pisces_xpmem_state * state = (struct pisces_xpmem_state *)priv_data;
struct xpmem_cmd_ringbuf * buf = &(state->xpmem_buf);
if (data_len != sizeof(struct xpmem_cmd_ex)) {
printk(KERN_ERR "ERROR: DROPPING XPMEM CMD: MALFORMED CMD\n");
return;
}
/* Find open entry */
if (push_active_entry(buf, (struct xpmem_cmd_ex *)data) != 0) {
printk(KERN_ERR "ERROR: DROPPING XPMEM CMD: NO ENTRIES AVAILABLE\n");
return;
}
atomic_inc(&(buf->active_entries));
mb();
waitq_wakeup(&(state->waitq));
/* Xbuf now complete */
pisces_xbuf_complete(state->xbuf_desc, NULL, 0);
}
// This has to be done in a single operation
static ssize_t
cmd_write(struct file * filp,
const char __user * ubuf,
size_t size,
loff_t * off)
{
u8 * resp = NULL;
cmd_data = NULL;
cmd_len = 0;
resp = kmem_alloc(size);
if (!resp) {
printk(KERN_ERR "Unable to allocate buffer for command response\n");
return -ENOMEM;
}
// write response to buffer
if (copy_from_user(resp, ubuf, size)) {
return -EINVAL;
}
pisces_xbuf_complete(xbuf_desc, resp, size);
kmem_free(resp);
return size;
}
