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IB/mlx5: Implement the file ops of DEVX async command FD

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Implement the file ops of the DEVX async command FD, this enables using
the FD for reading the events and manage other options on the FD.

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 08:29:58 +02:00 committed by Jason Gunthorpe
parent a124edba26
commit 4accbb3fd2
1 changed files with 55 additions and 2 deletions
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57
drivers/infiniband/hw/mlx5/devx.c
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@ -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 = {