drivers/gpu/drm/nouveau/nouveau_dma.h

   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 slots, int size);
  34 void nv50_dma_push(struct nouveau_channel *, u64 addr, u32 length,
  35                    bool no_prefetch);
  36
  37 /*
  38  * There's a hw race condition where you can't jump to your PUT offset,
  39  * to avoid this we jump to offset + SKIPS and fill the difference with
  40  * NOPs.
  41  *
  42  * xf86-video-nv configures the DMA fetch size to 32 bytes, and uses
  43  * a SKIPS value of 8.  Lets assume that the race condition is to do
  44  * with writing into the fetch area, we configure a fetch size of 128
  45  * bytes so we need a larger SKIPS value.
  46  */
  47 #define NOUVEAU_DMA_SKIPS (128 / 4)
  48
  49 /* Maximum push buffer size. */
  50 #define NV50_DMA_PUSH_MAX_LENGTH 0x7fffff
  51
  52 /* Object handles - for stuff that's doesn't use handle == oclass. */
  53 enum {
  54         NvDmaFB         = 0x80000002,
  55         NvDmaTT         = 0x80000003,
  56         NvNotify0       = 0x80000006,
  57         NvSema          = 0x8000000f,
  58         NvEvoSema0      = 0x80000010,
  59         NvEvoSema1      = 0x80000011,
  60 };
  61
  62 static __must_check inline int
  63 RING_SPACE(struct nouveau_channel *chan, int size)
  64 {
  65         int ret;
  66
  67         ret = nouveau_dma_wait(chan, 1, size);
  68         if (ret)
  69                 return ret;
  70
  71         chan->dma.free -= size;
  72         return 0;
  73 }
  74
  75 static inline void
  76 OUT_RING(struct nouveau_channel *chan, int data)
  77 {
  78         nouveau_bo_wr32(chan->push.buffer, chan->dma.cur++, data);
  79 }
  80
  81 #define WRITE_PUT(val) do {                                                    \
  82         mb();                                                   \
  83         nouveau_bo_rd32(chan->push.buffer, 0);                                 \
  84         nvif_wr32(&chan->user, chan->user_put, ((val) << 2) + chan->push.addr);\
  85 } while (0)
  86
  87 static inline void
  88 FIRE_RING(struct nouveau_channel *chan)
  89 {
  90         if (chan->dma.cur == chan->dma.put)
  91                 return;
  92         chan->accel_done = true;
  93
  94         if (chan->dma.ib_max) {
  95                 nv50_dma_push(chan, chan->push.addr + (chan->dma.put << 2),
  96                               (chan->dma.cur - chan->dma.put) << 2, false);
  97         } else {
  98                 WRITE_PUT(chan->dma.cur);
  99         }
 100
 101         chan->dma.put = chan->dma.cur;
 102 }
 103
 104 static inline void
 105 WIND_RING(struct nouveau_channel *chan)
 106 {
 107         chan->dma.cur = chan->dma.put;
 108 }
 109
 110 /* NV_SW object class */
 111 #define NV_SW_DMA_VBLSEM                                             0x0000018c
 112 #define NV_SW_VBLSEM_OFFSET                                          0x00000400
 113 #define NV_SW_VBLSEM_RELEASE_VALUE                                   0x00000404
 114 #define NV_SW_VBLSEM_RELEASE                                         0x00000408
 115 #define NV_SW_PAGE_FLIP                                              0x00000500
 116
 117 #endif