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 <engine/fifo.h>
  26
  27 #include "nouveau_drm.h"
  28 #include "nouveau_dma.h"
  29 #include "nouveau_fence.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 nouveau_channel *chan = fence->channel;
  43         int ret = RING_SPACE(chan, 2);
  44         if (ret == 0) {
  45                 BEGIN_NV04(chan, NvSubSw, 0x0150, 1);
  46                 OUT_RING  (chan, fence->sequence);
  47                 FIRE_RING (chan);
  48         }
  49         return ret;
  50 }
  51
  52 static int
  53 nv04_fence_sync(struct nouveau_fence *fence,
  54                 struct nouveau_channel *prev, struct nouveau_channel *chan)
  55 {
  56         return -ENODEV;
  57 }
  58
  59 static u32
  60 nv04_fence_read(struct nouveau_channel *chan)
  61 {
  62         struct nouveau_fifo_chan *fifo = (void *)chan->object;
  63         return atomic_read(&fifo->refcnt);
  64 }
  65
  66 static void
  67 nv04_fence_context_del(struct nouveau_channel *chan)
  68 {
  69         struct nv04_fence_chan *fctx = chan->fence;
  70         nouveau_fence_context_del(&fctx->base);
  71         chan->fence = NULL;
  72         kfree(fctx);
  73 }
  74
  75 static int
  76 nv04_fence_context_new(struct nouveau_channel *chan)
  77 {
  78         struct nv04_fence_chan *fctx = kzalloc(sizeof(*fctx), GFP_KERNEL);
  79         if (fctx) {
  80                 nouveau_fence_context_new(&fctx->base);
  81                 fctx->base.emit = nv04_fence_emit;
  82                 fctx->base.sync = nv04_fence_sync;
  83                 fctx->base.read = nv04_fence_read;
  84                 chan->fence = fctx;
  85                 return 0;
  86         }
  87         return -ENOMEM;
  88 }
  89
  90 static void
  91 nv04_fence_destroy(struct nouveau_drm *drm)
  92 {
  93         struct nv04_fence_priv *priv = drm->fence;
  94         drm->fence = NULL;
  95         kfree(priv);
  96 }
  97
  98 int
  99 nv04_fence_create(struct nouveau_drm *drm)
 100 {
 101         struct nv04_fence_priv *priv;
 102
 103         priv = drm->fence = kzalloc(sizeof(*priv), GFP_KERNEL);
 104         if (!priv)
 105                 return -ENOMEM;
 106
 107         priv->base.dtor = nv04_fence_destroy;
 108         priv->base.context_new = nv04_fence_context_new;
 109         priv->base.context_del = nv04_fence_context_del;
 110         return 0;
 111 }