summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/nouveau/nouveau_fence.c
blob: 5b5471ba6eda414029ba0ba521f4af5d08e35cd5 (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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
/*
 * Copyright (C) 2007 Ben Skeggs.
 * 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, sublicense, 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 NONINFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) 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 "drmP.h"
#include "drm.h"

#include <linux/ktime.h>
#include <linux/hrtimer.h>

#include "nouveau_drm.h"
#include "nouveau_dma.h"
#include "nouveau_fence.h"

void
nouveau_fence_context_del(struct nouveau_fence_chan *fctx)
{
	struct nouveau_fence *fence, *fnext;
	spin_lock(&fctx->lock);
	list_for_each_entry_safe(fence, fnext, &fctx->pending, head) {
		if (fence->work)
			fence->work(fence->priv, false);
		fence->channel = NULL;
		list_del(&fence->head);
		nouveau_fence_unref(&fence);
	}
	spin_unlock(&fctx->lock);
}

void
nouveau_fence_context_new(struct nouveau_fence_chan *fctx)
{
	INIT_LIST_HEAD(&fctx->flip);
	INIT_LIST_HEAD(&fctx->pending);
	spin_lock_init(&fctx->lock);
}

static void
nouveau_fence_update(struct nouveau_channel *chan)
{
	struct nouveau_fence_priv *priv = chan->drm->fence;
	struct nouveau_fence_chan *fctx = chan->fence;
	struct nouveau_fence *fence, *fnext;

	spin_lock(&fctx->lock);
	list_for_each_entry_safe(fence, fnext, &fctx->pending, head) {
		if (priv->read(chan) < fence->sequence)
			break;

		if (fence->work)
			fence->work(fence->priv, true);
		fence->channel = NULL;
		list_del(&fence->head);
		nouveau_fence_unref(&fence);
	}
	spin_unlock(&fctx->lock);
}

int
nouveau_fence_emit(struct nouveau_fence *fence, struct nouveau_channel *chan)
{
	struct nouveau_fence_priv *priv = chan->drm->fence;
	struct nouveau_fence_chan *fctx = chan->fence;
	int ret;

	fence->channel  = chan;
	fence->timeout  = jiffies + (3 * DRM_HZ);
	fence->sequence = ++fctx->sequence;

	ret = priv->emit(fence);
	if (!ret) {
		kref_get(&fence->kref);
		spin_lock(&fctx->lock);
		list_add_tail(&fence->head, &fctx->pending);
		spin_unlock(&fctx->lock);
	}

	return ret;
}

bool
nouveau_fence_done(struct nouveau_fence *fence)
{
	if (fence->channel)
		nouveau_fence_update(fence->channel);
	return !fence->channel;
}

int
nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)
{
	unsigned long sleep_time = NSEC_PER_MSEC / 1000;
	ktime_t t;
	int ret = 0;

	while (!nouveau_fence_done(fence)) {
		if (fence->timeout && time_after_eq(jiffies, fence->timeout)) {
			ret = -EBUSY;
			break;
		}

		__set_current_state(intr ? TASK_INTERRUPTIBLE :
					   TASK_UNINTERRUPTIBLE);
		if (lazy) {
			t = ktime_set(0, sleep_time);
			schedule_hrtimeout(&t, HRTIMER_MODE_REL);
			sleep_time *= 2;
			if (sleep_time > NSEC_PER_MSEC)
				sleep_time = NSEC_PER_MSEC;
		}

		if (intr && signal_pending(current)) {
			ret = -ERESTARTSYS;
			break;
		}
	}

	__set_current_state(TASK_RUNNING);
	return ret;
}

int
nouveau_fence_sync(struct nouveau_fence *fence, struct nouveau_channel *chan)
{
	struct nouveau_fence_priv *priv = chan->drm->fence;
	struct nouveau_channel *prev;
	int ret = 0;

	prev = fence ? fence->channel : NULL;
	if (prev) {
		if (unlikely(prev != chan && !nouveau_fence_done(fence))) {
			ret = priv->sync(fence, prev, chan);
			if (unlikely(ret))
				ret = nouveau_fence_wait(fence, true, false);
		}
	}

	return ret;
}

static void
nouveau_fence_del(struct kref *kref)
{
	struct nouveau_fence *fence = container_of(kref, typeof(*fence), kref);
	kfree(fence);
}

void
nouveau_fence_unref(struct nouveau_fence **pfence)
{
	if (*pfence)
		kref_put(&(*pfence)->kref, nouveau_fence_del);
	*pfence = NULL;
}

struct nouveau_fence *
nouveau_fence_ref(struct nouveau_fence *fence)
{
	kref_get(&fence->kref);
	return fence;
}

int
nouveau_fence_new(struct nouveau_channel *chan, struct nouveau_fence **pfence)
{
	struct nouveau_fence *fence;
	int ret = 0;

	if (unlikely(!chan->fence))
		return -ENODEV;

	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
	if (!fence)
		return -ENOMEM;
	kref_init(&fence->kref);

	if (chan) {
		ret = nouveau_fence_emit(fence, chan);
		if (ret)
			nouveau_fence_unref(&fence);
	}

	*pfence = fence;
	return ret;
}
OpenPOWER on IntegriCloud