Ejemplo n.º 1
0
/*
 * mei_wd_ops_ping - wd ping command from the watchdog core.
 *
 * @wd_dev - watchdog device struct
 *
 * returns 0 if success, negative errno code for failure
 */
static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
{
	struct mei_device *dev;
	struct mei_cl *cl;
	int ret;

	dev = watchdog_get_drvdata(wd_dev);
	if (!dev)
		return -ENODEV;

	cl = &dev->wd_cl;

	mutex_lock(&dev->device_lock);

	if (cl->state != MEI_FILE_CONNECTED) {
		dev_err(&dev->pdev->dev, "wd: not connected.\n");
		ret = -ENODEV;
		goto end;
	}

	dev->wd_state = MEI_WD_RUNNING;

	ret = mei_cl_flow_ctrl_creds(cl);
	if (ret < 0)
		goto end;

	/* Check if we can send the ping to HW*/
	if (ret && mei_hbuf_acquire(dev)) {
		dev_dbg(&dev->pdev->dev, "wd: sending ping\n");

		if (mei_wd_send(dev)) {
			dev_err(&dev->pdev->dev, "wd: send failed.\n");
			ret = -EIO;
			goto end;
		}

		if (mei_cl_flow_ctrl_reduce(cl)) {
			dev_err(&dev->pdev->dev, "wd: mei_cl_flow_ctrl_reduce() failed.\n");
			ret = -EIO;
			goto end;
		}

	} else {
		dev->wd_pending = true;
	}

end:
	mutex_unlock(&dev->device_lock);
	return ret;
}
Ejemplo n.º 2
0
/**
 * mei_wd_stop - sends watchdog stop message to fw.
 *
 * @dev: the device structure
 * @preserve: indicate if to keep the timeout value
 *
 * returns 0 if success,
 *	-EIO when message send fails
 *	-EINVAL when invalid message is to be sent
 */
int mei_wd_stop(struct mei_device *dev)
{
	int ret;

	if (dev->wd_cl.state != MEI_FILE_CONNECTED ||
	    dev->wd_state != MEI_WD_RUNNING)
		return 0;

	memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_STOP_MSG_SIZE);

	dev->wd_state = MEI_WD_STOPPING;

	ret = mei_cl_flow_ctrl_creds(&dev->wd_cl);
	if (ret < 0)
		goto out;

	if (ret && mei_hbuf_acquire(dev)) {
		ret = 0;
		if (!mei_wd_send(dev)) {
			ret = mei_cl_flow_ctrl_reduce(&dev->wd_cl);
			if (ret)
				goto out;
		} else {
			dev_err(&dev->pdev->dev, "wd: send stop failed\n");
		}

		dev->wd_pending = false;
	} else {
		dev->wd_pending = true;
	}

	mutex_unlock(&dev->device_lock);

	ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
					dev->wd_state == MEI_WD_IDLE,
					msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
	mutex_lock(&dev->device_lock);
	if (dev->wd_state == MEI_WD_IDLE) {
		dev_dbg(&dev->pdev->dev, "wd: stop completed ret=%d.\n", ret);
		ret = 0;
	} else {
		if (!ret)
			ret = -ETIMEDOUT;
		dev_warn(&dev->pdev->dev,
			"wd: stop failed to complete ret=%d.\n", ret);
	}

out:
	return ret;
}
Ejemplo n.º 3
0
/**
 * mei_wd_stop - sends watchdog stop message to fw.
 *
 * @dev: the device structure
 *
 * Return: 0 if success
 * on error:
 *	-EIO    when message send fails
 *	-EINVAL when invalid message is to be sent
 *	-ETIME  on message timeout
 */
int mei_wd_stop(struct mei_device *dev)
{
	struct mei_cl *cl = &dev->wd_cl;
	int ret;

	if (!mei_cl_is_connected(cl) ||
	    dev->wd_state != MEI_WD_RUNNING)
		return 0;

	memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_STOP_MSG_SIZE);

	dev->wd_state = MEI_WD_STOPPING;

	ret = mei_cl_flow_ctrl_creds(cl);
	if (ret < 0)
		goto err;

	if (ret && mei_hbuf_acquire(dev)) {
		ret = mei_wd_send(dev);
		if (ret)
			goto err;
		dev->wd_pending = false;
	} else {
		dev->wd_pending = true;
	}

	mutex_unlock(&dev->device_lock);

	ret = wait_event_timeout(dev->wait_stop_wd,
				dev->wd_state == MEI_WD_IDLE,
				msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
	mutex_lock(&dev->device_lock);
	if (dev->wd_state != MEI_WD_IDLE) {
		/* timeout */
		ret = -ETIME;
		dev_warn(dev->dev, "wd: stop failed to complete ret=%d\n", ret);
		goto err;
	}
	dev_dbg(dev->dev, "wd: stop completed after %u msec\n",
			MEI_WD_STOP_TIMEOUT - jiffies_to_msecs(ret));
	return 0;
err:
	return ret;
}
Ejemplo n.º 4
0
/**
 * mei_wd_ops_ping - wd ping command from the watchdog core.
 *
 * @wd_dev: watchdog device struct
 *
 * Return: 0 if success, negative errno code for failure
 */
static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
{
	struct mei_device *dev;
	struct mei_cl *cl;
	int ret;

	dev = watchdog_get_drvdata(wd_dev);
	if (!dev)
		return -ENODEV;

	cl = &dev->wd_cl;

	mutex_lock(&dev->device_lock);

	if (!mei_cl_is_connected(cl)) {
		cl_err(dev, cl, "wd: not connected.\n");
		ret = -ENODEV;
		goto end;
	}

	dev->wd_state = MEI_WD_RUNNING;

	ret = mei_cl_flow_ctrl_creds(cl);
	if (ret < 0)
		goto end;

	/* Check if we can send the ping to HW*/
	if (ret && mei_hbuf_acquire(dev)) {
		dev_dbg(dev->dev, "wd: sending ping\n");

		ret = mei_wd_send(dev);
		if (ret)
			goto end;
		dev->wd_pending = false;
	} else {
		dev->wd_pending = true;
	}

end:
	mutex_unlock(&dev->device_lock);
	return ret;
}