1 /* $NetBSD: vmwgfx_marker.c,v 1.4 2022/10/25 23:35:43 riastradh Exp $ */
2
3 // SPDX-License-Identifier: GPL-2.0 OR MIT
4 /**************************************************************************
5 *
6 * Copyright 2010 VMware, Inc., Palo Alto, CA., USA
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sub license, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial portions
18 * of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
23 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
24 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
25 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
26 * USE OR OTHER DEALINGS IN THE SOFTWARE.
27 *
28 **************************************************************************/
29
30
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: vmwgfx_marker.c,v 1.4 2022/10/25 23:35:43 riastradh Exp $");
33
34 #include "vmwgfx_drv.h"
35
36 struct vmw_marker {
37 struct list_head head;
38 uint32_t seqno;
39 u64 submitted;
40 };
41
vmw_marker_queue_init(struct vmw_marker_queue * queue)42 void vmw_marker_queue_init(struct vmw_marker_queue *queue)
43 {
44 INIT_LIST_HEAD(&queue->head);
45 queue->lag = 0;
46 queue->lag_time = ktime_get_raw_ns();
47 spin_lock_init(&queue->lock);
48 }
49
vmw_marker_queue_takedown(struct vmw_marker_queue * queue)50 void vmw_marker_queue_takedown(struct vmw_marker_queue *queue)
51 {
52 struct vmw_marker *marker, *next;
53
54 list_for_each_entry_safe(marker, next, &queue->head, head) {
55 kfree(marker);
56 }
57 spin_lock_destroy(&queue->lock);
58 }
59
vmw_marker_push(struct vmw_marker_queue * queue,uint32_t seqno)60 int vmw_marker_push(struct vmw_marker_queue *queue,
61 uint32_t seqno)
62 {
63 struct vmw_marker *marker = kmalloc(sizeof(*marker), GFP_KERNEL);
64
65 if (unlikely(!marker))
66 return -ENOMEM;
67
68 marker->seqno = seqno;
69 marker->submitted = ktime_get_raw_ns();
70 spin_lock(&queue->lock);
71 list_add_tail(&marker->head, &queue->head);
72 spin_unlock(&queue->lock);
73
74 return 0;
75 }
76
vmw_marker_pull(struct vmw_marker_queue * queue,uint32_t signaled_seqno)77 int vmw_marker_pull(struct vmw_marker_queue *queue,
78 uint32_t signaled_seqno)
79 {
80 struct vmw_marker *marker, *next;
81 bool updated = false;
82 u64 now;
83
84 spin_lock(&queue->lock);
85 now = ktime_get_raw_ns();
86
87 if (list_empty(&queue->head)) {
88 queue->lag = 0;
89 queue->lag_time = now;
90 updated = true;
91 goto out_unlock;
92 }
93
94 list_for_each_entry_safe(marker, next, &queue->head, head) {
95 if (signaled_seqno - marker->seqno > (1 << 30))
96 continue;
97
98 queue->lag = now - marker->submitted;
99 queue->lag_time = now;
100 updated = true;
101 list_del(&marker->head);
102 kfree(marker);
103 }
104
105 out_unlock:
106 spin_unlock(&queue->lock);
107
108 return (updated) ? 0 : -EBUSY;
109 }
110
vmw_fifo_lag(struct vmw_marker_queue * queue)111 static u64 vmw_fifo_lag(struct vmw_marker_queue *queue)
112 {
113 u64 now;
114
115 spin_lock(&queue->lock);
116 now = ktime_get_raw_ns();
117 queue->lag += now - queue->lag_time;
118 queue->lag_time = now;
119 spin_unlock(&queue->lock);
120 return queue->lag;
121 }
122
123
vmw_lag_lt(struct vmw_marker_queue * queue,uint32_t us)124 static bool vmw_lag_lt(struct vmw_marker_queue *queue,
125 uint32_t us)
126 {
127 u64 cond = (u64) us * NSEC_PER_USEC;
128
129 return vmw_fifo_lag(queue) <= cond;
130 }
131
vmw_wait_lag(struct vmw_private * dev_priv,struct vmw_marker_queue * queue,uint32_t us)132 int vmw_wait_lag(struct vmw_private *dev_priv,
133 struct vmw_marker_queue *queue, uint32_t us)
134 {
135 struct vmw_marker *marker;
136 uint32_t seqno;
137 int ret;
138
139 while (!vmw_lag_lt(queue, us)) {
140 spin_lock(&queue->lock);
141 if (list_empty(&queue->head))
142 seqno = atomic_read(&dev_priv->marker_seq);
143 else {
144 marker = list_first_entry(&queue->head,
145 struct vmw_marker, head);
146 seqno = marker->seqno;
147 }
148 spin_unlock(&queue->lock);
149
150 ret = vmw_wait_seqno(dev_priv, false, seqno, true,
151 3*HZ);
152
153 if (unlikely(ret != 0))
154 return ret;
155
156 (void) vmw_marker_pull(queue, seqno);
157 }
158 return 0;
159 }
160