drivers/gpu/drm/nouveau/nv04_fence.c

   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 "drmP.h"
  26 #include "nouveau_drv.h"
  27 #include "nouveau_dma.h"
  28 #include "nouveau_ramht.h"
  29 #include "nouveau_fence.h"
  30
  31 struct nv04_fence_chan {
  32         struct nouveau_fence_chan base;
  33         atomic_t sequence;
  34 };
  35
  36 struct nv04_fence_priv {
  37         struct nouveau_fence_priv base;
  38 };
  39
  40 static int
  41 nv04_fence_emit(struct nouveau_fence *fence)
  42 {
  43         struct nouveau_channel *chan = fence->channel;
  44         int ret = RING_SPACE(chan, 2);
  45         if (ret == 0) {
  46                 BEGIN_NV04(chan, NvSubSw, 0x0150, 1);
  47                 OUT_RING  (chan, fence->sequence);
  48                 FIRE_RING (chan);
  49         }
  50         return ret;
  51 }
  52
  53 static int
  54 nv04_fence_sync(struct nouveau_fence *fence,
  55                 struct nouveau_channel *prev, struct nouveau_channel *chan)
  56 {
  57         return -ENODEV;
  58 }
  59
  60 int
  61 nv04_fence_mthd(struct nouveau_channel *chan, u32 class, u32 mthd, u32 data)
  62 {
  63         struct nv04_fence_chan *fctx = chan->engctx[NVOBJ_ENGINE_FENCE];
  64         atomic_set(&fctx->sequence, data);
  65         return 0;
  66 }
  67
  68 static u32
  69 nv04_fence_read(struct nouveau_channel *chan)
  70 {
  71         struct nv04_fence_chan *fctx = chan->engctx[NVOBJ_ENGINE_FENCE];
  72         return atomic_read(&fctx->sequence);
  73 }
  74
  75 static void
  76 nv04_fence_context_del(struct nouveau_channel *chan, int engine)
  77 {
  78         struct nv04_fence_chan *fctx = chan->engctx[engine];
  79         nouveau_fence_context_del(&fctx->base);
  80         chan->engctx[engine] = NULL;
  81         kfree(fctx);
  82 }
  83
  84 static int
  85 nv04_fence_context_new(struct nouveau_channel *chan, int engine)
  86 {
  87         struct nv04_fence_chan *fctx = kzalloc(sizeof(*fctx), GFP_KERNEL);
  88         if (fctx) {
  89                 nouveau_fence_context_new(&fctx->base);
  90                 atomic_set(&fctx->sequence, 0);
  91                 chan->engctx[engine] = fctx;
  92                 return 0;
  93         }
  94         return -ENOMEM;
  95 }
  96
  97 static int
  98 nv04_fence_fini(struct drm_device *dev, int engine, bool suspend)
  99 {
 100         return 0;
 101 }
 102
 103 static int
 104 nv04_fence_init(struct drm_device *dev, int engine)
 105 {
 106         return 0;
 107 }
 108
 109 static void
 110 nv04_fence_destroy(struct drm_device *dev, int engine)
 111 {
 112         struct drm_nouveau_private *dev_priv = dev->dev_private;
 113         struct nv04_fence_priv *priv = nv_engine(dev, engine);
 114
 115         dev_priv->eng[engine] = NULL;
 116         kfree(priv);
 117 }
 118
 119 int
 120 nv04_fence_create(struct drm_device *dev)
 121 {
 122         struct drm_nouveau_private *dev_priv = dev->dev_private;
 123         struct nv04_fence_priv *priv;
 124         int ret;
 125
 126         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 127         if (!priv)
 128                 return -ENOMEM;
 129
 130         priv->base.engine.destroy = nv04_fence_destroy;
 131         priv->base.engine.init = nv04_fence_init;
 132         priv->base.engine.fini = nv04_fence_fini;
 133         priv->base.engine.context_new = nv04_fence_context_new;
 134         priv->base.engine.context_del = nv04_fence_context_del;
 135         priv->base.emit = nv04_fence_emit;
 136         priv->base.sync = nv04_fence_sync;
 137         priv->base.read = nv04_fence_read;
 138         dev_priv->eng[NVOBJ_ENGINE_FENCE] = &priv->base.engine;
 139         return ret;
 140 }