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}