1 /*
2  * Copyright 2012 Red Hat Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: Ben Skeggs
23  */
24 
25 #include "nouveau_drm.h"
26 #include "nouveau_dma.h"
27 #include "nouveau_fence.h"
28 
29 struct nv04_fence_chan {
30 	struct nouveau_fence_chan base;
31 };
32 
33 struct nv04_fence_priv {
34 	struct nouveau_fence_priv base;
35 };
36 
37 static int
38 nv04_fence_emit(struct nouveau_fence *fence)
39 {
40 	struct nouveau_channel *chan = fence->channel;
41 	int ret = RING_SPACE(chan, 2);
42 	if (ret == 0) {
43 		BEGIN_NV04(chan, NvSubSw, 0x0150, 1);
44 		OUT_RING  (chan, fence->base.seqno);
45 		FIRE_RING (chan);
46 	}
47 	return ret;
48 }
49 
50 static int
51 nv04_fence_sync(struct nouveau_fence *fence,
52 		struct nouveau_channel *prev, struct nouveau_channel *chan)
53 {
54 	return -ENODEV;
55 }
56 
57 static u32
58 nv04_fence_read(struct nouveau_channel *chan)
59 {
60 	struct nouveau_fifo_chan *fifo = nvkm_fifo_chan(chan);;
61 	return atomic_read(&fifo->refcnt);
62 }
63 
64 static void
65 nv04_fence_context_del(struct nouveau_channel *chan)
66 {
67 	struct nv04_fence_chan *fctx = chan->fence;
68 	nouveau_fence_context_del(&fctx->base);
69 	chan->fence = NULL;
70 	nouveau_fence_context_free(&fctx->base);
71 }
72 
73 static int
74 nv04_fence_context_new(struct nouveau_channel *chan)
75 {
76 	struct nv04_fence_chan *fctx = kzalloc(sizeof(*fctx), GFP_KERNEL);
77 	if (fctx) {
78 		nouveau_fence_context_new(chan, &fctx->base);
79 		fctx->base.emit = nv04_fence_emit;
80 		fctx->base.sync = nv04_fence_sync;
81 		fctx->base.read = nv04_fence_read;
82 		chan->fence = fctx;
83 		return 0;
84 	}
85 	return -ENOMEM;
86 }
87 
88 static void
89 nv04_fence_destroy(struct nouveau_drm *drm)
90 {
91 	struct nv04_fence_priv *priv = drm->fence;
92 	drm->fence = NULL;
93 	kfree(priv);
94 }
95 
96 int
97 nv04_fence_create(struct nouveau_drm *drm)
98 {
99 	struct nv04_fence_priv *priv;
100 
101 	priv = drm->fence = kzalloc(sizeof(*priv), GFP_KERNEL);
102 	if (!priv)
103 		return -ENOMEM;
104 
105 	priv->base.dtor = nv04_fence_destroy;
106 	priv->base.context_new = nv04_fence_context_new;
107 	priv->base.context_del = nv04_fence_context_del;
108 	priv->base.contexts = 15;
109 	priv->base.context_base = fence_context_alloc(priv->base.contexts);
110 	return 0;
111 }
112