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