nv10_fence.c

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/*
 * 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 <[email protected]>
 */

#include <core/object.h>
#include <core/class.h>

#include "nouveau_drm.h"
#include "nouveau_dma.h"
#include "nouveau_fence.h"

struct nv10_fence_chan {
    struct nouveau_fence_chan base;
};

struct nv10_fence_priv {
    struct nouveau_fence_priv base;
    struct nouveau_bo *bo;
    spinlock_t lock;
    u32 sequence;
};

int
nv10_fence_emit(struct nouveau_fence *fence)
{
    struct nouveau_channel *chan = fence->channel;
    int ret = RING_SPACE(chan, 2);
    if (ret == 0) {
        BEGIN_NV04(chan, 0, NV10_SUBCHAN_REF_CNT, 1);
        OUT_RING  (chan, fence->sequence);
        FIRE_RING (chan);
    }
    return ret;
}


static int
nv10_fence_sync(struct nouveau_fence *fence,
        struct nouveau_channel *prev, struct nouveau_channel *chan)
{
    return -ENODEV;
}

int
nv17_fence_sync(struct nouveau_fence *fence,
        struct nouveau_channel *prev, struct nouveau_channel *chan)
{
    struct nv10_fence_priv *priv = chan->drm->fence;
    u32 value;
    int ret;

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

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

    ret = RING_SPACE(prev, 5);
    if (!ret) {
        BEGIN_NV04(prev, 0, NV11_SUBCHAN_DMA_SEMAPHORE, 4);
        OUT_RING  (prev, NvSema);
        OUT_RING  (prev, 0);
        OUT_RING  (prev, value + 0);
        OUT_RING  (prev, value + 1);
        FIRE_RING (prev);
    }

    if (!ret && !(ret = RING_SPACE(chan, 5))) {
        BEGIN_NV04(chan, 0, NV11_SUBCHAN_DMA_SEMAPHORE, 4);
        OUT_RING  (chan, NvSema);
        OUT_RING  (chan, 0);
        OUT_RING  (chan, value + 1);
        OUT_RING  (chan, value + 2);
        FIRE_RING (chan);
    }

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

u32
nv10_fence_read(struct nouveau_channel *chan)
{
    return nv_ro32(chan->object, 0x0048);
}

void
nv10_fence_context_del(struct nouveau_channel *chan)
{
    struct nv10_fence_chan *fctx = chan->fence;
    nouveau_fence_context_del(&fctx->base);
    chan->fence = NULL;
    kfree(fctx);
}

static int
nv10_fence_context_new(struct nouveau_channel *chan)
{
    struct nv10_fence_priv *priv = chan->drm->fence;
    struct nv10_fence_chan *fctx;
    int ret = 0;

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

    nouveau_fence_context_new(&fctx->base);

    if (priv->bo) {
        struct ttm_mem_reg *mem = &priv->bo->bo.mem;
        struct nouveau_object *object;
        u32 start = mem->start * PAGE_SIZE;
        u32 limit = mem->start + mem->size - 1;

        ret = nouveau_object_new(nv_object(chan->cli), chan->handle,
                     NvSema, 0x0002,
                     &(struct nv_dma_class) {
                        .flags = NV_DMA_TARGET_VRAM |
                             NV_DMA_ACCESS_RDWR,
                        .start = start,
                        .limit = limit,
                     }, sizeof(struct nv_dma_class),
                     &object);
    }

    if (ret)
        nv10_fence_context_del(chan);
    return ret;
}

void
nv10_fence_destroy(struct nouveau_drm *drm)
{
    struct nv10_fence_priv *priv = drm->fence;
    nouveau_bo_unmap(priv->bo);
    nouveau_bo_ref(NULL, &priv->bo);
    drm->fence = NULL;
    kfree(priv);
}

int
nv10_fence_create(struct nouveau_drm *drm)
{
    struct nv10_fence_priv *priv;
    int ret = 0;

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

    priv->base.dtor = nv10_fence_destroy;
    priv->base.context_new = nv10_fence_context_new;
    priv->base.context_del = nv10_fence_context_del;
    priv->base.emit = nv10_fence_emit;
    priv->base.read = nv10_fence_read;
    priv->base.sync = nv10_fence_sync;
    spin_lock_init(&priv->lock);

    if (nv_device(drm->device)->chipset >= 0x17) {
        ret = nouveau_bo_new(drm->dev, 4096, 0x1000, TTM_PL_FLAG_VRAM,
                     0, 0x0000, NULL, &priv->bo);
        if (!ret) {
            ret = nouveau_bo_pin(priv->bo, TTM_PL_FLAG_VRAM);
            if (!ret)
                ret = nouveau_bo_map(priv->bo);
            if (ret)
                nouveau_bo_ref(NULL, &priv->bo);
        }

        if (ret == 0) {
            nouveau_bo_wr32(priv->bo, 0x000, 0x00000000);
            priv->base.sync = nv17_fence_sync;
        }
    }

    if (ret)
        nv10_fence_destroy(drm);
    return ret;
}