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_drv.h"
26 #include "nouveau_dma.h"
27 #include "nouveau_fence.h"
28 
29 #include <nvif/if0004.h>
30 
31 struct nv04_fence_chan {
32 	struct nouveau_fence_chan base;
33 };
34 
35 struct nv04_fence_priv {
36 	struct nouveau_fence_priv base;
37 };
38 
39 static int
40 nv04_fence_emit(struct nouveau_fence *fence)
41 {
42 	struct nouveau_channel *chan = fence->channel;
43 	int ret = RING_SPACE(chan, 2);
44 	if (ret == 0) {
45 		BEGIN_NV04(chan, NvSubSw, 0x0150, 1);
46 		OUT_RING  (chan, fence->base.seqno);
47 		FIRE_RING (chan);
48 	}
49 	return ret;
50 }
51 
52 static int
53 nv04_fence_sync(struct nouveau_fence *fence,
54 		struct nouveau_channel *prev, struct nouveau_channel *chan)
55 {
56 	return -ENODEV;
57 }
58 
59 static u32
60 nv04_fence_read(struct nouveau_channel *chan)
61 {
62 	struct nv04_nvsw_get_ref_v0 args = {};
63 	WARN_ON(nvif_object_mthd(&chan->nvsw, NV04_NVSW_GET_REF,
64 				 &args, sizeof(args)));
65 	return args.ref;
66 }
67 
68 static void
69 nv04_fence_context_del(struct nouveau_channel *chan)
70 {
71 	struct nv04_fence_chan *fctx = chan->fence;
72 	nouveau_fence_context_del(&fctx->base);
73 	chan->fence = NULL;
74 	nouveau_fence_context_free(&fctx->base);
75 }
76 
77 static int
78 nv04_fence_context_new(struct nouveau_channel *chan)
79 {
80 	struct nv04_fence_chan *fctx = kzalloc(sizeof(*fctx), GFP_KERNEL);
81 	if (fctx) {
82 		nouveau_fence_context_new(chan, &fctx->base);
83 		fctx->base.emit = nv04_fence_emit;
84 		fctx->base.sync = nv04_fence_sync;
85 		fctx->base.read = nv04_fence_read;
86 		chan->fence = fctx;
87 		return 0;
88 	}
89 	return -ENOMEM;
90 }
91 
92 static void
93 nv04_fence_destroy(struct nouveau_drm *drm)
94 {
95 	struct nv04_fence_priv *priv = drm->fence;
96 	drm->fence = NULL;
97 	kfree(priv);
98 }
99 
100 int
101 nv04_fence_create(struct nouveau_drm *drm)
102 {
103 	struct nv04_fence_priv *priv;
104 
105 	priv = drm->fence = kzalloc(sizeof(*priv), GFP_KERNEL);
106 	if (!priv)
107 		return -ENOMEM;
108 
109 	priv->base.dtor = nv04_fence_destroy;
110 	priv->base.context_new = nv04_fence_context_new;
111 	priv->base.context_del = nv04_fence_context_del;
112 	return 0;
113 }
114