156 lines
3.8 KiB
C
156 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
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/**************************************************************************
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*
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* Copyright 2010 VMware, Inc., Palo Alto, CA., USA
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#include "vmwgfx_drv.h"
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struct vmw_marker {
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struct list_head head;
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uint32_t seqno;
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u64 submitted;
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};
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void vmw_marker_queue_init(struct vmw_marker_queue *queue)
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{
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INIT_LIST_HEAD(&queue->head);
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queue->lag = 0;
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queue->lag_time = ktime_get_raw_ns();
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spin_lock_init(&queue->lock);
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}
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void vmw_marker_queue_takedown(struct vmw_marker_queue *queue)
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{
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struct vmw_marker *marker, *next;
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spin_lock(&queue->lock);
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list_for_each_entry_safe(marker, next, &queue->head, head) {
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kfree(marker);
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}
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spin_unlock(&queue->lock);
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}
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int vmw_marker_push(struct vmw_marker_queue *queue,
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uint32_t seqno)
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{
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struct vmw_marker *marker = kmalloc(sizeof(*marker), GFP_KERNEL);
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if (unlikely(!marker))
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return -ENOMEM;
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marker->seqno = seqno;
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marker->submitted = ktime_get_raw_ns();
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spin_lock(&queue->lock);
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list_add_tail(&marker->head, &queue->head);
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spin_unlock(&queue->lock);
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return 0;
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}
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int vmw_marker_pull(struct vmw_marker_queue *queue,
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uint32_t signaled_seqno)
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{
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struct vmw_marker *marker, *next;
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bool updated = false;
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u64 now;
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spin_lock(&queue->lock);
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now = ktime_get_raw_ns();
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if (list_empty(&queue->head)) {
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queue->lag = 0;
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queue->lag_time = now;
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updated = true;
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goto out_unlock;
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}
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list_for_each_entry_safe(marker, next, &queue->head, head) {
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if (signaled_seqno - marker->seqno > (1 << 30))
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continue;
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queue->lag = now - marker->submitted;
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queue->lag_time = now;
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updated = true;
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list_del(&marker->head);
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kfree(marker);
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}
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out_unlock:
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spin_unlock(&queue->lock);
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return (updated) ? 0 : -EBUSY;
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}
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static u64 vmw_fifo_lag(struct vmw_marker_queue *queue)
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{
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u64 now;
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spin_lock(&queue->lock);
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now = ktime_get_raw_ns();
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queue->lag += now - queue->lag_time;
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queue->lag_time = now;
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spin_unlock(&queue->lock);
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return queue->lag;
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}
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static bool vmw_lag_lt(struct vmw_marker_queue *queue,
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uint32_t us)
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{
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u64 cond = (u64) us * NSEC_PER_USEC;
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return vmw_fifo_lag(queue) <= cond;
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}
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int vmw_wait_lag(struct vmw_private *dev_priv,
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struct vmw_marker_queue *queue, uint32_t us)
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{
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struct vmw_marker *marker;
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uint32_t seqno;
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int ret;
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while (!vmw_lag_lt(queue, us)) {
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spin_lock(&queue->lock);
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if (list_empty(&queue->head))
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seqno = atomic_read(&dev_priv->marker_seq);
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else {
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marker = list_first_entry(&queue->head,
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struct vmw_marker, head);
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seqno = marker->seqno;
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}
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spin_unlock(&queue->lock);
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ret = vmw_wait_seqno(dev_priv, false, seqno, true,
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3*HZ);
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if (unlikely(ret != 0))
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return ret;
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(void) vmw_marker_pull(queue, seqno);
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}
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return 0;
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}
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