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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;
}
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