base.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
 */

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

#include <engine/dmaobj.h>
#include <engine/fifo.h>

int
nouveau_fifo_channel_create_(struct nouveau_object *parent,
                 struct nouveau_object *engine,
                 struct nouveau_oclass *oclass,
                 int bar, u32 addr, u32 size, u32 pushbuf,
                 u32 engmask, int len, void **ptr)
{
    struct nouveau_device *device = nv_device(engine);
    struct nouveau_fifo *priv = (void *)engine;
    struct nouveau_fifo_chan *chan;
    struct nouveau_dmaeng *dmaeng;
    unsigned long flags;
    int ret;

    /* create base object class */
    ret = nouveau_namedb_create_(parent, engine, oclass, 0, NULL,
                     engmask, len, ptr);
    chan = *ptr;
    if (ret)
        return ret;

    /* validate dma object representing push buffer */
    chan->pushdma = (void *)nouveau_handle_ref(parent, pushbuf);
    if (!chan->pushdma)
        return -ENOENT;

    dmaeng = (void *)chan->pushdma->base.engine;
    switch (chan->pushdma->base.oclass->handle) {
    case 0x0002:
    case 0x003d:
        break;
    default:
        return -EINVAL;
    }

    if (dmaeng->bind) {
        ret = dmaeng->bind(dmaeng, parent, chan->pushdma, &chan->pushgpu);
        if (ret)
            return ret;
    }

    /* find a free fifo channel */
    spin_lock_irqsave(&priv->lock, flags);
    for (chan->chid = priv->min; chan->chid < priv->max; chan->chid++) {
        if (!priv->channel[chan->chid]) {
            priv->channel[chan->chid] = nv_object(chan);
            break;
        }
    }
    spin_unlock_irqrestore(&priv->lock, flags);

    if (chan->chid == priv->max) {
        nv_error(priv, "no free channels\n");
        return -ENOSPC;
    }

    /* map fifo control registers */
    chan->user = ioremap(pci_resource_start(device->pdev, bar) + addr +
                 (chan->chid * size), size);
    if (!chan->user)
        return -EFAULT;

    chan->size = size;
    return 0;
}

void
nouveau_fifo_channel_destroy(struct nouveau_fifo_chan *chan)
{
    struct nouveau_fifo *priv = (void *)nv_object(chan)->engine;
    unsigned long flags;

    iounmap(chan->user);

    spin_lock_irqsave(&priv->lock, flags);
    priv->channel[chan->chid] = NULL;
    spin_unlock_irqrestore(&priv->lock, flags);

    nouveau_gpuobj_ref(NULL, &chan->pushgpu);
    nouveau_object_ref(NULL, (struct nouveau_object **)&chan->pushdma);
    nouveau_namedb_destroy(&chan->base);
}

void
_nouveau_fifo_channel_dtor(struct nouveau_object *object)
{
    struct nouveau_fifo_chan *chan = (void *)object;
    nouveau_fifo_channel_destroy(chan);
}

u32
_nouveau_fifo_channel_rd32(struct nouveau_object *object, u32 addr)
{
    struct nouveau_fifo_chan *chan = (void *)object;
    return ioread32_native(chan->user + addr);
}

void
_nouveau_fifo_channel_wr32(struct nouveau_object *object, u32 addr, u32 data)
{
    struct nouveau_fifo_chan *chan = (void *)object;
    iowrite32_native(data, chan->user + addr);
}

static int
nouveau_fifo_chid(struct nouveau_fifo *priv, struct nouveau_object *object)
{
    int engidx = nv_hclass(priv) & 0xff;

    while (object && object->parent) {
        if ( nv_iclass(object->parent, NV_ENGCTX_CLASS) &&
            (nv_hclass(object->parent) & 0xff) == engidx)
            return nouveau_fifo_chan(object)->chid;
        object = object->parent;
    }

    return -1;
}

void
nouveau_fifo_destroy(struct nouveau_fifo *priv)
{
    kfree(priv->channel);
    nouveau_engine_destroy(&priv->base);
}

int
nouveau_fifo_create_(struct nouveau_object *parent,
             struct nouveau_object *engine,
             struct nouveau_oclass *oclass,
             int min, int max, int length, void **pobject)
{
    struct nouveau_fifo *priv;
    int ret;

    ret = nouveau_engine_create_(parent, engine, oclass, true, "PFIFO",
                     "fifo", length, pobject);
    priv = *pobject;
    if (ret)
        return ret;

    priv->min = min;
    priv->max = max;
    priv->channel = kzalloc(sizeof(*priv->channel) * (max + 1), GFP_KERNEL);
    if (!priv->channel)
        return -ENOMEM;

    priv->chid = nouveau_fifo_chid;
    spin_lock_init(&priv->lock);
    return 0;
}