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/**************************************************************************

 *

 * Copyright (C) 2010 VMware, Inc., Palo Alto, CA., USA

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL

 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,

 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

 * USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 **************************************************************************/

#include "vmwgfx_drv.h"

struct vmw_marker {

	struct list_head head;

	uint32_t seqno;

	u64 submitted;

};

void vmw_marker_queue_init(struct vmw_marker_queue *queue)

{

	INIT_LIST_HEAD(&queue->head);

	queue->lag = 0;

	queue->lag_time = ktime_get_raw_ns();

	spin_lock_init(&queue->lock);

}

void vmw_marker_queue_takedown(struct vmw_marker_queue *queue)

{

	struct vmw_marker *marker, *next;

	spin_lock(&queue->lock);

	list_for_each_entry_safe(marker, next, &queue->head, head) {

		kfree(marker);

	}

	spin_unlock(&queue->lock);

}

int vmw_marker_push(struct vmw_marker_queue *queue,

		   uint32_t seqno)

{

	struct vmw_marker *marker = kmalloc(sizeof(*marker), GFP_KERNEL);

	if (unlikely(!marker))

		return -ENOMEM;

	marker->seqno = seqno;

	marker->submitted = ktime_get_raw_ns();

	spin_lock(&queue->lock);

	list_add_tail(&marker->head, &queue->head);

	spin_unlock(&queue->lock);

	return 0;

}

int vmw_marker_pull(struct vmw_marker_queue *queue,

		   uint32_t signaled_seqno)

{

	struct vmw_marker *marker, *next;

	bool updated = false;

	u64 now;

	spin_lock(&queue->lock);

	now = ktime_get_raw_ns();

	if (list_empty(&queue->head)) {

		queue->lag = 0;

		queue->lag_time = now;

		updated = true;

		goto out_unlock;

	}

	list_for_each_entry_safe(marker, next, &queue->head, head) {

		if (signaled_seqno - marker->seqno > (1 << 30))

			continue;

		queue->lag = now - marker->submitted;

		queue->lag_time = now;

		updated = true;

		list_del(&marker->head);

		kfree(marker);

	}

out_unlock:

	spin_unlock(&queue->lock);

	return (updated) ? 0 : -EBUSY;

}

static u64 vmw_fifo_lag(struct vmw_marker_queue *queue)

{

	u64 now;

	spin_lock(&queue->lock);

	now = ktime_get_raw_ns();

	queue->lag += now - queue->lag_time;

	queue->lag_time = now;

	spin_unlock(&queue->lock);

	return queue->lag;

}

static bool vmw_lag_lt(struct vmw_marker_queue *queue,

		       uint32_t us)

{

	u64 cond = (u64) us * NSEC_PER_USEC;

	return vmw_fifo_lag(queue) <= cond;

}

int vmw_wait_lag(struct vmw_private *dev_priv,

		 struct vmw_marker_queue *queue, uint32_t us)

{

	struct vmw_marker *marker;

	uint32_t seqno;

	int ret;

	while (!vmw_lag_lt(queue, us)) {

		spin_lock(&queue->lock);

		if (list_empty(&queue->head))

			seqno = atomic_read(&dev_priv->marker_seq);

		else {

			marker = list_first_entry(&queue->head,

						 struct vmw_marker, head);

			seqno = marker->seqno;

		}

		spin_unlock(&queue->lock);

		ret = vmw_wait_seqno(dev_priv, false, seqno, true,

					3*HZ);

		if (unlikely(ret != 0))

			return ret;

		(void) vmw_marker_pull(queue, seqno);

	}

	return 0;

}