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Commit 237092bf authored by Tomas Winkler's avatar Tomas Winkler Committed by Greg Kroah-Hartman
Browse files

mei: implement fasync for event notification 



A process can be informed about client notification also via
SIGIO with POLL_PRI event.

Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2c84c297

drivers/misc/mei/client.c

+27 −0
Original line number Diff line number Diff line
@@ -1350,6 +1350,33 @@ int mei_cl_notify_request(struct mei_cl *cl, struct file *file, u8 request) 
	return rets;

}



/**

 * mei_cl_notify - raise notification

 *

 * @cl: host client

 *

 * Locking: called under "dev->device_lock" lock

 */

void mei_cl_notify(struct mei_cl *cl)

{

	struct mei_device *dev;



	if (!cl || !cl->dev)

		return;



	dev = cl->dev;



	if (!cl->notify_en)

		return;



	cl_dbg(dev, cl, "notify event");

	cl->notify_ev = true;

	wake_up_interruptible_all(&cl->ev_wait);



	if (cl->ev_async)

		kill_fasync(&cl->ev_async, SIGIO, POLL_PRI);

}



/**

 * mei_cl_notify_get - get or wait for notification event

 *

drivers/misc/mei/client.h

+1 −0
Original line number Diff line number Diff line
@@ -225,6 +225,7 @@ int mei_cl_notify_request(struct mei_cl *cl, struct file *file, u8 request); 
int mei_cl_irq_notify(struct mei_cl *cl, struct mei_cl_cb *cb,

		      struct mei_cl_cb *cmpl_list);

int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev);

void mei_cl_notify(struct mei_cl *cl);



void mei_cl_all_disconnect(struct mei_device *dev);

void mei_cl_all_wakeup(struct mei_device *dev);

drivers/misc/mei/hbm.c

+2 −4
Original line number Diff line number Diff line
@@ -514,10 +514,8 @@ static void mei_hbm_cl_notify(struct mei_device *dev, 
	struct mei_cl *cl;



	cl = mei_hbm_cl_find_by_cmd(dev, cmd);

	if (cl && cl->notify_en) {

		cl->notify_ev = true;

		wake_up_interruptible(&cl->ev_wait);

	}

	if (cl)

		mei_cl_notify(cl);

}



/**

drivers/misc/mei/main.c

+21 −0
Original line number Diff line number Diff line
@@ -650,6 +650,26 @@ static unsigned int mei_poll(struct file *file, poll_table *wait) 
	return mask;

}



/**

 * mei_fasync - asynchronous io support

 *

 * @fd: file descriptor

 * @file: pointer to file structure

 * @band: band bitmap

 *

 * Return: poll mask

 */

static int mei_fasync(int fd, struct file *file, int band)

{



	struct mei_cl *cl = file->private_data;



	if (!mei_cl_is_connected(cl))

		return POLLERR;



	return fasync_helper(fd, file, band, &cl->ev_async);

}



/**

 * fw_status_show - mei device attribute show method

 *
@@ -702,6 +722,7 @@ static const struct file_operations mei_fops = { 
	.release = mei_release,

	.write = mei_write,

	.poll = mei_poll,

	.fasync = mei_fasync,

	.llseek = no_llseek

};

drivers/misc/mei/mei_dev.h

+2 −0
Original line number Diff line number Diff line
@@ -236,6 +236,7 @@ struct mei_cl_cb { 
 * @rx_wait: wait queue for rx completion

 * @wait:  wait queue for management operation

 * @ev_wait: notification wait queue

 * @ev_async: event async notification

 * @status: connection status

 * @me_cl: fw client connected

 * @host_client_id: host id
@@ -258,6 +259,7 @@ struct mei_cl { 
	wait_queue_head_t rx_wait;

	wait_queue_head_t wait;

	wait_queue_head_t ev_wait;

	struct fasync_struct *ev_async;

	int status;

	struct mei_me_client *me_cl;

	u8 host_client_id;