summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/vmwgfx/vmwgfx_marker.c
blob: e53bc639a7549a5d4f7bff2e26997de7e1f6b481 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
 *
 * Copyright 2010 VMware, Inc., Palo Alto, CA., USA
 *
 * 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;
}