forked from Minki/linux
IB/mlx5: Implement DEVX hot unplug for async command FD
Implement DEVX hot unplug for the async command FD. This is done by managing a list of the inflight commands and wait until all launched work is completed as part of devx_hot_unplug_async_cmd_event_file. Signed-off-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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4accbb3fd2
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@ -1184,6 +1184,7 @@ struct devx_async_event_queue {
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wait_queue_head_t poll_wait;
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struct list_head event_list;
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atomic_t bytes_in_use;
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u8 is_destroyed:1;
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};
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struct devx_async_cmd_event_file {
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@ -1198,6 +1199,7 @@ static void devx_init_event_queue(struct devx_async_event_queue *ev_queue)
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INIT_LIST_HEAD(&ev_queue->event_list);
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init_waitqueue_head(&ev_queue->poll_wait);
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atomic_set(&ev_queue->bytes_in_use, 0);
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ev_queue->is_destroyed = 0;
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}
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static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_ASYNC_CMD_FD_ALLOC)(
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@ -1488,9 +1490,15 @@ static ssize_t devx_async_cmd_event_read(struct file *filp, char __user *buf,
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if (wait_event_interruptible(
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ev_queue->poll_wait,
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!list_empty(&ev_queue->event_list))) {
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(!list_empty(&ev_queue->event_list) ||
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ev_queue->is_destroyed))) {
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return -ERESTARTSYS;
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}
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if (list_empty(&ev_queue->event_list) &&
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ev_queue->is_destroyed)
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return -EIO;
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spin_lock_irq(&ev_queue->lock);
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}
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@ -1544,7 +1552,9 @@ static __poll_t devx_async_cmd_event_poll(struct file *filp,
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poll_wait(filp, &ev_queue->poll_wait, wait);
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spin_lock_irq(&ev_queue->lock);
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if (!list_empty(&ev_queue->event_list))
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if (ev_queue->is_destroyed)
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pollflags = EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
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else if (!list_empty(&ev_queue->event_list))
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pollflags = EPOLLIN | EPOLLRDNORM;
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spin_unlock_irq(&ev_queue->lock);
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@ -1565,6 +1575,14 @@ static int devx_hot_unplug_async_cmd_event_file(struct ib_uobject *uobj,
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struct devx_async_cmd_event_file *comp_ev_file =
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container_of(uobj, struct devx_async_cmd_event_file,
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uobj);
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struct devx_async_event_queue *ev_queue = &comp_ev_file->ev_queue;
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spin_lock_irq(&ev_queue->lock);
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ev_queue->is_destroyed = 1;
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spin_unlock_irq(&ev_queue->lock);
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if (why == RDMA_REMOVE_DRIVER_REMOVE)
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wake_up_interruptible(&ev_queue->poll_wait);
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mlx5_cmd_cleanup_async_ctx(&comp_ev_file->async_ctx);
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return 0;
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