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 #include "nouveau_drv.h"
25 #include "nouveau_dma.h"
26 #include "nouveau_fence.h"
27 
28 #include <nvif/if0004.h>
29 #include <nvif/push006c.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 nvif_push *push = unrcu_pointer(fence->channel)->chan.push;
43 	int ret = PUSH_WAIT(push, 2);
44 	if (ret == 0) {
45 		PUSH_NVSQ(push, NV_SW, 0x0150, fence->base.seqno);
46 		PUSH_KICK(push);
47 	}
48 	return ret;
49 }
50 
51 static int
52 nv04_fence_sync(struct nouveau_fence *fence,
53 		struct nouveau_channel *prev, struct nouveau_channel *chan)
54 {
55 	return -ENODEV;
56 }
57 
58 static u32
59 nv04_fence_read(struct nouveau_channel *chan)
60 {
61 	struct nv04_nvsw_get_ref_v0 args = {};
62 	WARN_ON(nvif_object_mthd(&chan->nvsw, NV04_NVSW_GET_REF,
63 				 &args, sizeof(args)));
64 	return args.ref;
65 }
66 
67 static void
68 nv04_fence_context_del(struct nouveau_channel *chan)
69 {
70 	struct nv04_fence_chan *fctx = chan->fence;
71 	nouveau_fence_context_del(&fctx->base);
72 	chan->fence = NULL;
73 	nouveau_fence_context_free(&fctx->base);
74 }
75 
76 static int
77 nv04_fence_context_new(struct nouveau_channel *chan)
78 {
79 	struct nv04_fence_chan *fctx = kzalloc(sizeof(*fctx), GFP_KERNEL);
80 	if (fctx) {
81 		nouveau_fence_context_new(chan, &fctx->base);
82 		fctx->base.emit = nv04_fence_emit;
83 		fctx->base.sync = nv04_fence_sync;
84 		fctx->base.read = nv04_fence_read;
85 		chan->fence = fctx;
86 		return 0;
87 	}
88 	return -ENOMEM;
89 }
90 
91 static void
92 nv04_fence_destroy(struct nouveau_drm *drm)
93 {
94 	struct nv04_fence_priv *priv = drm->fence;
95 	drm->fence = NULL;
96 	kfree(priv);
97 }
98 
99 int
100 nv04_fence_create(struct nouveau_drm *drm)
101 {
102 	struct nv04_fence_priv *priv;
103 
104 	priv = drm->fence = kzalloc(sizeof(*priv), GFP_KERNEL);
105 	if (!priv)
106 		return -ENOMEM;
107 
108 	priv->base.dtor = nv04_fence_destroy;
109 	priv->base.context_new = nv04_fence_context_new;
110 	priv->base.context_del = nv04_fence_context_del;
111 	return 0;
112 }
113