/*
 * 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
 */

#include "nouveau_drv.h"
#include "nouveau_dma.h"
#include "nouveau_fence.h"
#include "nouveau_vmm.h"

#include "nv50_display.h"

static int
nv84_fence_emit32(struct nouveau_channel *chan, u64 virtual, u32 sequence)
{
        int ret = RING_SPACE(chan, 8);
        if (ret == 0) {
                BEGIN_NV04(chan, 0, NV11_SUBCHAN_DMA_SEMAPHORE, 1);
                OUT_RING  (chan, chan->vram.handle);
                BEGIN_NV04(chan, 0, NV84_SUBCHAN_SEMAPHORE_ADDRESS_HIGH, 5);
                OUT_RING  (chan, upper_32_bits(virtual));
                OUT_RING  (chan, lower_32_bits(virtual));
                OUT_RING  (chan, sequence);
                OUT_RING  (chan, NV84_SUBCHAN_SEMAPHORE_TRIGGER_WRITE_LONG);
                OUT_RING  (chan, 0x00000000);
                FIRE_RING (chan);
        }
        return ret;
}

static int
nv84_fence_sync32(struct nouveau_channel *chan, u64 virtual, u32 sequence)
{
        int ret = RING_SPACE(chan, 7);
        if (ret == 0) {
                BEGIN_NV04(chan, 0, NV11_SUBCHAN_DMA_SEMAPHORE, 1);
                OUT_RING  (chan, chan->vram.handle);
                BEGIN_NV04(chan, 0, NV84_SUBCHAN_SEMAPHORE_ADDRESS_HIGH, 4);
                OUT_RING  (chan, upper_32_bits(virtual));
                OUT_RING  (chan, lower_32_bits(virtual));
                OUT_RING  (chan, sequence);
                OUT_RING  (chan, NV84_SUBCHAN_SEMAPHORE_TRIGGER_ACQUIRE_GEQUAL);
                FIRE_RING (chan);
        }
        return ret;
}

static int
nv84_fence_emit(struct nouveau_fence *fence)
{
        struct nouveau_channel *chan = fence->channel;
        struct nv84_fence_chan *fctx = chan->fence;
        u64 addr = fctx->vma->addr + chan->chid * 16;

        return fctx->base.emit32(chan, addr, fence->base.seqno);
}

static int
nv84_fence_sync(struct nouveau_fence *fence,
                struct nouveau_channel *prev, struct nouveau_channel *chan)
{
        struct nv84_fence_chan *fctx = chan->fence;
        u64 addr = fctx->vma->addr + prev->chid * 16;

        return fctx->base.sync32(chan, addr, fence->base.seqno);
}

static u32
nv84_fence_read(struct nouveau_channel *chan)
{
        struct nv84_fence_priv *priv = chan->drm->fence;
        return nouveau_bo_rd32(priv->bo, chan->chid * 16/4);
}

static void
nv84_fence_context_del(struct nouveau_channel *chan)
{
        struct nv84_fence_priv *priv = chan->drm->fence;
        struct nv84_fence_chan *fctx = chan->fence;

        nouveau_bo_wr32(priv->bo, chan->chid * 16 / 4, fctx->base.sequence);
        mutex_lock(&priv->mutex);
        nouveau_vma_del(&fctx->vma);
        mutex_unlock(&priv->mutex);
        nouveau_fence_context_del(&fctx->base);
        chan->fence = NULL;
        nouveau_fence_context_free(&fctx->base);
}

int
nv84_fence_context_new(struct nouveau_channel *chan)
{
        struct nv84_fence_priv *priv = chan->drm->fence;
        struct nv84_fence_chan *fctx;
        int ret;

        fctx = chan->fence = kzalloc(sizeof(*fctx), GFP_KERNEL);
        if (!fctx)
                return -ENOMEM;

        nouveau_fence_context_new(chan, &fctx->base);
        fctx->base.emit = nv84_fence_emit;
        fctx->base.sync = nv84_fence_sync;
        fctx->base.read = nv84_fence_read;
        fctx->base.emit32 = nv84_fence_emit32;
        fctx->base.sync32 = nv84_fence_sync32;
        fctx->base.sequence = nv84_fence_read(chan);

        mutex_lock(&priv->mutex);
        ret = nouveau_vma_new(priv->bo, chan->vmm, &fctx->vma);
        mutex_unlock(&priv->mutex);

        if (ret)
                nv84_fence_context_del(chan);
        return ret;
}

static bool
nv84_fence_suspend(struct nouveau_drm *drm)
{
        struct nv84_fence_priv *priv = drm->fence;
        int i;

        priv->suspend = vmalloc(array_size(sizeof(u32), drm->chan.nr));
        if (priv->suspend) {
                for (i = 0; i < drm->chan.nr; i++)
                        priv->suspend[i] = nouveau_bo_rd32(priv->bo, i*4);
        }

        return priv->suspend != NULL;
}

static void
nv84_fence_resume(struct nouveau_drm *drm)
{
        struct nv84_fence_priv *priv = drm->fence;
        int i;

        if (priv->suspend) {
                for (i = 0; i < drm->chan.nr; i++)
                        nouveau_bo_wr32(priv->bo, i*4, priv->suspend[i]);
                vfree(priv->suspend);
                priv->suspend = NULL;
        }
}

static void
nv84_fence_destroy(struct nouveau_drm *drm)
{
        struct nv84_fence_priv *priv = drm->fence;
        nouveau_bo_unmap(priv->bo);
        if (priv->bo)
                nouveau_bo_unpin(priv->bo);
        nouveau_bo_ref(NULL, &priv->bo);
        drm->fence = NULL;
        kfree(priv);
}

int
nv84_fence_create(struct nouveau_drm *drm)
{
        struct nv84_fence_priv *priv;
        u32 domain;
        int ret;

        priv = drm->fence = kzalloc(sizeof(*priv), GFP_KERNEL);
        if (!priv)
                return -ENOMEM;

        priv->base.dtor = nv84_fence_destroy;
        priv->base.suspend = nv84_fence_suspend;
        priv->base.resume = nv84_fence_resume;
        priv->base.context_new = nv84_fence_context_new;
        priv->base.context_del = nv84_fence_context_del;

        priv->base.uevent = true;

        mutex_init(&priv->mutex);

        /* Use VRAM if there is any ; otherwise fallback to system memory */
        domain = drm->client.device.info.ram_size != 0 ? TTM_PL_FLAG_VRAM :
                         /*
                          * fences created in sysmem must be non-cached or we
                          * will lose CPU/GPU coherency!
                          */
                         TTM_PL_FLAG_TT | TTM_PL_FLAG_UNCACHED;
        ret = nouveau_bo_new(&drm->client, 16 * drm->chan.nr, 0,
                             domain, 0, 0, NULL, NULL, &priv->bo);
        if (ret == 0) {
                ret = nouveau_bo_pin(priv->bo, domain, false);
                if (ret == 0) {
                        ret = nouveau_bo_map(priv->bo);
                        if (ret)
                                nouveau_bo_unpin(priv->bo);
                }
                if (ret)
                        nouveau_bo_ref(NULL, &priv->bo);
        }

        if (ret)
                nv84_fence_destroy(drm);
        return ret;
}