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Commit abdf119b authored by Gleb Natapov's avatar Gleb Natapov Committed by Roland Dreier
Browse files

[IB/uverbs]: Add O_ASYNC support 



Add support for O_ASYNC notifications on userspace verbs
completion and asynchronous event file descriptors.

Signed-off-by: default avatarGleb Natapov <glebn@voltaire.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 42b1806d

drivers/infiniband/core/uverbs.h

+1 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ struct ib_uverbs_event_file { 
	int					fd;

	int					is_async;

	wait_queue_head_t			poll_wait;

	struct fasync_struct		       *async_queue;

	struct list_head			event_list;

};

drivers/infiniband/core/uverbs_main.c

+13 −1
Original line number Diff line number Diff line
@@ -257,11 +257,19 @@ static void ib_uverbs_event_release(struct ib_uverbs_event_file *file) 
	spin_unlock_irq(&file->lock);

}



static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)

{

	struct ib_uverbs_event_file *file = filp->private_data;



	return fasync_helper(fd, filp, on, &file->async_queue);

}



static int ib_uverbs_event_close(struct inode *inode, struct file *filp)

{

	struct ib_uverbs_event_file *file = filp->private_data;



	ib_uverbs_event_release(file);

	ib_uverbs_event_fasync(-1, filp, 0);

	kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);



	return 0;
@@ -276,7 +284,8 @@ static struct file_operations uverbs_event_fops = { 
	 */

	.read 	 = ib_uverbs_event_read,

	.poll    = ib_uverbs_event_poll,

	.release = ib_uverbs_event_close

	.release = ib_uverbs_event_close,

	.fasync  = ib_uverbs_event_fasync

};



void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
@@ -296,6 +305,7 @@ void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 
	spin_unlock_irqrestore(&file->comp_file[0].lock, flags);



	wake_up_interruptible(&file->comp_file[0].poll_wait);

	kill_fasync(&file->comp_file[0].async_queue, SIGIO, POLL_IN);

}



static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
@@ -316,6 +326,7 @@ static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 
	spin_unlock_irqrestore(&file->async_file.lock, flags);



	wake_up_interruptible(&file->async_file.poll_wait);

	kill_fasync(&file->async_file.async_queue, SIGIO, POLL_IN);

}



void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
@@ -350,6 +361,7 @@ static int ib_uverbs_event_init(struct ib_uverbs_event_file *file, 
	INIT_LIST_HEAD(&file->event_list);

	init_waitqueue_head(&file->poll_wait);

	file->uverbs_file = uverbs_file;

	file->async_queue = NULL;



	file->fd = get_unused_fd();

	if (file->fd < 0)