diff options
Diffstat (limited to 'drivers/infiniband')
-rw-r--r-- | drivers/infiniband/hw/mlx5/devx.c | 57 |
1 files changed, 55 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/mlx5/devx.c b/drivers/infiniband/hw/mlx5/devx.c index 9ca116155f9c..234e413c7ab8 100644 --- a/drivers/infiniband/hw/mlx5/devx.c +++ b/drivers/infiniband/hw/mlx5/devx.c @@ -1472,7 +1472,49 @@ static int devx_umem_cleanup(struct ib_uobject *uobject, static ssize_t devx_async_cmd_event_read(struct file *filp, char __user *buf, size_t count, loff_t *pos) { - return -EINVAL; + struct devx_async_cmd_event_file *comp_ev_file = filp->private_data; + struct devx_async_event_queue *ev_queue = &comp_ev_file->ev_queue; + struct devx_async_data *event; + int ret = 0; + size_t eventsz; + + spin_lock_irq(&ev_queue->lock); + + while (list_empty(&ev_queue->event_list)) { + spin_unlock_irq(&ev_queue->lock); + + if (filp->f_flags & O_NONBLOCK) + return -EAGAIN; + + if (wait_event_interruptible( + ev_queue->poll_wait, + !list_empty(&ev_queue->event_list))) { + return -ERESTARTSYS; + } + spin_lock_irq(&ev_queue->lock); + } + + event = list_entry(ev_queue->event_list.next, + struct devx_async_data, list); + eventsz = event->cmd_out_len + + sizeof(struct mlx5_ib_uapi_devx_async_cmd_hdr); + + if (eventsz > count) { + spin_unlock_irq(&ev_queue->lock); + return -ENOSPC; + } + + list_del(ev_queue->event_list.next); + spin_unlock_irq(&ev_queue->lock); + + if (copy_to_user(buf, &event->hdr, eventsz)) + ret = -EFAULT; + else + ret = eventsz; + + atomic_sub(event->cmd_out_len, &ev_queue->bytes_in_use); + kvfree(event); + return ret; } static int devx_async_cmd_event_close(struct inode *inode, struct file *filp) @@ -1495,7 +1537,18 @@ static int devx_async_cmd_event_close(struct inode *inode, struct file *filp) static __poll_t devx_async_cmd_event_poll(struct file *filp, struct poll_table_struct *wait) { - return 0; + struct devx_async_cmd_event_file *comp_ev_file = filp->private_data; + struct devx_async_event_queue *ev_queue = &comp_ev_file->ev_queue; + __poll_t pollflags = 0; + + poll_wait(filp, &ev_queue->poll_wait, wait); + + spin_lock_irq(&ev_queue->lock); + if (!list_empty(&ev_queue->event_list)) + pollflags = EPOLLIN | EPOLLRDNORM; + spin_unlock_irq(&ev_queue->lock); + + return pollflags; } const struct file_operations devx_async_cmd_event_fops = { |