1 /*
2 * Copyright (C) 2007 Ben Skeggs.
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial
15 * portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 *
25 */
26
27 #ifndef __NOUVEAU_DMA_H__
28 #define __NOUVEAU_DMA_H__
29
30 #include "nouveau_bo.h"
31 #include "nouveau_chan.h"
32
33 int nouveau_dma_wait(struct nouveau_channel *, int size);
34
35 /*
36 * There's a hw race condition where you can't jump to your PUT offset,
37 * to avoid this we jump to offset + SKIPS and fill the difference with
38 * NOPs.
39 *
40 * xf86-video-nv configures the DMA fetch size to 32 bytes, and uses
41 * a SKIPS value of 8. Lets assume that the race condition is to do
42 * with writing into the fetch area, we configure a fetch size of 128
43 * bytes so we need a larger SKIPS value.
44 */
45 #define NOUVEAU_DMA_SKIPS (128 / 4)
46
47 /* Maximum push buffer size. */
48 #define NV50_DMA_PUSH_MAX_LENGTH 0x7fffff
49
50 /* Maximum IBs per ring. */
51 #define NV50_DMA_IB_MAX ((0x02000 / 8) - 1)
52
53 /* Object handles - for stuff that's doesn't use handle == oclass. */
54 enum {
55 NvDmaFB = 0x80000002,
56 NvDmaTT = 0x80000003,
57 NvNotify0 = 0x80000006,
58 NvSema = 0x8000000f,
59 NvEvoSema0 = 0x80000010,
60 NvEvoSema1 = 0x80000011,
61 };
62
63 static __must_check inline int
RING_SPACE(struct nouveau_channel * chan,int size)64 RING_SPACE(struct nouveau_channel *chan, int size)
65 {
66 int ret;
67
68 ret = nouveau_dma_wait(chan, size);
69 if (ret)
70 return ret;
71
72 chan->dma.free -= size;
73 return 0;
74 }
75
76 static inline void
OUT_RING(struct nouveau_channel * chan,int data)77 OUT_RING(struct nouveau_channel *chan, int data)
78 {
79 nouveau_bo_wr32(chan->push.buffer, chan->dma.cur++, data);
80 }
81
82 #define WRITE_PUT(val) do { \
83 mb(); \
84 nouveau_bo_rd32(chan->push.buffer, 0); \
85 nvif_wr32(&chan->user, chan->user_put, ((val) << 2) + chan->push.addr);\
86 } while (0)
87
88 static inline void
FIRE_RING(struct nouveau_channel * chan)89 FIRE_RING(struct nouveau_channel *chan)
90 {
91 if (chan->dma.cur == chan->dma.put)
92 return;
93 chan->accel_done = true;
94
95 WRITE_PUT(chan->dma.cur);
96
97 chan->dma.put = chan->dma.cur;
98 }
99
100 static inline void
WIND_RING(struct nouveau_channel * chan)101 WIND_RING(struct nouveau_channel *chan)
102 {
103 chan->dma.cur = chan->dma.put;
104 }
105
106 /* NV_SW object class */
107 #define NV_SW_DMA_VBLSEM 0x0000018c
108 #define NV_SW_VBLSEM_OFFSET 0x00000400
109 #define NV_SW_VBLSEM_RELEASE_VALUE 0x00000404
110 #define NV_SW_VBLSEM_RELEASE 0x00000408
111 #define NV_SW_PAGE_FLIP 0x00000500
112
113 #endif
114