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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>
This commit is contained in:
Yishai Hadas 2019-01-22 08:29:59 +02:00 committed by Jason Gunthorpe
parent 4accbb3fd2
commit eaebaf77e7
1 changed files with 20 additions and 2 deletions
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22
drivers/infiniband/hw/mlx5/devx.c
View File

@ -1184,6 +1184,7 @@ struct devx_async_event_queue {
wait_queue_head_t poll_wait;
struct list_head event_list;
atomic_t bytes_in_use;
u8 is_destroyed:1;
};
struct devx_async_cmd_event_file {
@ -1198,6 +1199,7 @@ static void devx_init_event_queue(struct devx_async_event_queue *ev_queue)
INIT_LIST_HEAD(&ev_queue->event_list);
init_waitqueue_head(&ev_queue->poll_wait);
atomic_set(&ev_queue->bytes_in_use, 0);
ev_queue->is_destroyed = 0;
}
static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_ASYNC_CMD_FD_ALLOC)(
@ -1488,9 +1490,15 @@ static ssize_t devx_async_cmd_event_read(struct file *filp, char __user *buf,
if (wait_event_interruptible(
ev_queue->poll_wait,
!list_empty(&ev_queue->event_list))) {
(!list_empty(&ev_queue->event_list) ||
ev_queue->is_destroyed))) {
return -ERESTARTSYS;
}
if (list_empty(&ev_queue->event_list) &&
ev_queue->is_destroyed)
return -EIO;
spin_lock_irq(&ev_queue->lock);
}
@ -1544,7 +1552,9 @@ static __poll_t devx_async_cmd_event_poll(struct file *filp,
poll_wait(filp, &ev_queue->poll_wait, wait);
spin_lock_irq(&ev_queue->lock);
if (!list_empty(&ev_queue->event_list))
if (ev_queue->is_destroyed)
pollflags = EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
else if (!list_empty(&ev_queue->event_list))
pollflags = EPOLLIN | EPOLLRDNORM;
spin_unlock_irq(&ev_queue->lock);
@ -1565,6 +1575,14 @@ static int devx_hot_unplug_async_cmd_event_file(struct ib_uobject *uobj,
struct devx_async_cmd_event_file *comp_ev_file =
container_of(uobj, struct devx_async_cmd_event_file,
uobj);
struct devx_async_event_queue *ev_queue = &comp_ev_file->ev_queue;
spin_lock_irq(&ev_queue->lock);
ev_queue->is_destroyed = 1;
spin_unlock_irq(&ev_queue->lock);
if (why == RDMA_REMOVE_DRIVER_REMOVE)
wake_up_interruptible(&ev_queue->poll_wait);
mlx5_cmd_cleanup_async_ctx(&comp_ev_file->async_ctx);
return 0;