/*
 * Copyright 2012 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs <bskeggs@redhat.com>
 */
#include "nouveau_drv.h"
#include "nouveau_dma.h"
#include "nv10_fence.h"

#include <nvif/push006c.h>

#include <nvif/class.h>
#include <nvif/cl0002.h>

#include <nvhw/class/cl176e.h>

int
nv17_fence_sync(struct nouveau_fence *fence,
                struct nouveau_channel *prev, struct nouveau_channel *chan)
{
        struct nouveau_cli *cli = prev->cli;
        struct nv10_fence_priv *priv = cli->drm->fence;
        struct nv10_fence_chan *fctx = chan->fence;
        struct nvif_push *ppush = &prev->chan.push;
        struct nvif_push *npush = &chan->chan.push;
        u32 value;
        int ret;

        if (!mutex_trylock(&cli->mutex))
                return -EBUSY;

        spin_lock(&priv->lock);
        value = priv->sequence;
        priv->sequence += 2;
        spin_unlock(&priv->lock);

        ret = PUSH_WAIT(ppush, 5);
        if (!ret) {
                PUSH_MTHD(ppush, NV176E, SET_CONTEXT_DMA_SEMAPHORE, fctx->sema.handle,
                                         SEMAPHORE_OFFSET, 0,
                                         SEMAPHORE_ACQUIRE, value + 0,
                                         SEMAPHORE_RELEASE, value + 1);
                PUSH_KICK(ppush);
        }

        if (!ret && !(ret = PUSH_WAIT(npush, 5))) {
                PUSH_MTHD(npush, NV176E, SET_CONTEXT_DMA_SEMAPHORE, fctx->sema.handle,
                                         SEMAPHORE_OFFSET, 0,
                                         SEMAPHORE_ACQUIRE, value + 1,
                                         SEMAPHORE_RELEASE, value + 2);
                PUSH_KICK(npush);
        }

        mutex_unlock(&cli->mutex);
        return 0;
}

static int
nv17_fence_context_new(struct nouveau_channel *chan)
{
        struct nv10_fence_priv *priv = chan->cli->drm->fence;
        struct ttm_resource *reg = priv->bo->bo.resource;
        struct nv10_fence_chan *fctx;
        u32 start = reg->start * PAGE_SIZE;
        u32 limit = start + priv->bo->bo.base.size - 1;
        int ret = 0;

        fctx = chan->fence = kzalloc_obj(*fctx);
        if (!fctx)
                return -ENOMEM;

        nouveau_fence_context_new(chan, &fctx->base);
        fctx->base.emit = nv10_fence_emit;
        fctx->base.read = nv10_fence_read;
        fctx->base.sync = nv17_fence_sync;

        ret = nvif_object_ctor(&chan->user, "fenceCtxDma", NvSema,
                               NV_DMA_FROM_MEMORY,
                               &(struct nv_dma_v0) {
                                        .target = NV_DMA_V0_TARGET_VRAM,
                                        .access = NV_DMA_V0_ACCESS_RDWR,
                                        .start = start,
                                        .limit = limit,
                               }, sizeof(struct nv_dma_v0),
                               &fctx->sema);
        if (ret)
                nv10_fence_context_del(chan);
        return ret;
}

void
nv17_fence_resume(struct nouveau_drm *drm)
{
        struct nv10_fence_priv *priv = drm->fence;

        nouveau_bo_wr32(priv->bo, 0, priv->sequence);
}

int
nv17_fence_create(struct nouveau_drm *drm)
{
        struct nv10_fence_priv *priv;
        int ret = 0;

        priv = drm->fence = kzalloc_obj(*priv);
        if (!priv)
                return -ENOMEM;

        priv->base.dtor = nv10_fence_destroy;
        priv->base.resume = nv17_fence_resume;
        priv->base.context_new = nv17_fence_context_new;
        priv->base.context_del = nv10_fence_context_del;
        spin_lock_init(&priv->lock);

        ret = nouveau_bo_new_map(&drm->client, NOUVEAU_GEM_DOMAIN_VRAM, PAGE_SIZE, &priv->bo);
        if (ret) {
                nv10_fence_destroy(drm);
                return ret;
        }

        nouveau_bo_wr32(priv->bo, 0x000, 0x00000000);
        return ret;
}