Commit 5baaf71f authored by Tomas Winkler's avatar Tomas Winkler Committed by Greg Kroah-Hartman
Browse files

mei: export active connections to debugfs 



Export active connection state to debugfs
The information displayed is [me,host] id pair,
client connection state, and client's read and write states

Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Reviewed-by: default avatarAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7d93e58d

drivers/misc/mei/debugfs.c

+54 −0
Original line number Diff line number Diff line
@@ -75,6 +75,54 @@ static const struct file_operations mei_dbgfs_fops_meclients = { 
	.llseek = generic_file_llseek,

};



static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,

					size_t cnt, loff_t *ppos)

{

	struct mei_device *dev = fp->private_data;

	struct mei_cl *cl;

	const size_t bufsz = 1024;

	char *buf;

	int i = 0;

	int pos = 0;

	int ret;



	if (!dev)

		return -ENODEV;



	buf = kzalloc(bufsz, GFP_KERNEL);

	if  (!buf)

		return -ENOMEM;



	pos += scnprintf(buf + pos, bufsz - pos,

			"  |me|host|state|rd|wr|\n");



	mutex_lock(&dev->device_lock);



	/*  if the driver is not enabled the list won't b consitent */

	if (dev->dev_state != MEI_DEV_ENABLED)

		goto out;



	list_for_each_entry(cl, &dev->file_list, link) {



		pos += scnprintf(buf + pos, bufsz - pos,

			"%2d|%2d|%4d|%5d|%2d|%2d|\n",

			i, cl->me_client_id, cl->host_client_id, cl->state,

			cl->reading_state, cl->writing_state);

		i++;

	}

out:

	mutex_unlock(&dev->device_lock);

	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);

	kfree(buf);

	return ret;

}



static const struct file_operations mei_dbgfs_fops_active = {

	.open = simple_open,

	.read = mei_dbgfs_read_active,

	.llseek = generic_file_llseek,

};



static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,

					size_t cnt, loff_t *ppos)

{
@@ -128,6 +176,12 @@ int mei_dbgfs_register(struct mei_device *dev, const char *name) 
		dev_err(&dev->pdev->dev, "meclients: registration failed\n");

		goto err;

	}

	f = debugfs_create_file("active", S_IRUSR, dir,

				dev, &mei_dbgfs_fops_active);

	if (!f) {

		dev_err(&dev->pdev->dev, "meclients: registration failed\n");

		goto err;

	}

	f = debugfs_create_file("devstate", S_IRUSR, dir,

				dev, &mei_dbgfs_fops_devstate);

	if (!f) {

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