LXR linux/drivers/gpu/drm/nouveau/nv04

   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
  31struct nv04_fence_chan {
  32        struct nouveau_fence_chan base;
  33};
  34
  35struct nv04_fence_priv {
  36        struct nouveau_fence_priv base;
  37};
  38
  39static int
  40nv04_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
  52static int
  53nv04_fence_sync(struct nouveau_fence *fence,
  54                struct nouveau_channel *prev, struct nouveau_channel *chan)
  55{
  56        return -ENODEV;
  57}
  58
  59static u32
  60nv04_fence_read(struct nouveau_channel *chan)
  61{
  62        struct nouveau_fifo_chan *fifo = (void *)chan->object;
  63        return atomic_read(&fifo->refcnt);
  64}
  65
  66static void
  67nv04_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
  75static int
  76nv04_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
  90static void
  91nv04_fence_destroy(struct nouveau_drm *drm)
  92{
  93        struct nv04_fence_priv *priv = drm->fence;
  94        drm->fence = NULL;
  95        kfree(priv);
  96}
  97
  98int
  99nv04_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}
 112