ramht.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.
 */

#include <core/object.h>
#include <core/ramht.h>
#include <core/math.h>

#include <subdev/bar.h>

static u32
nouveau_ramht_hash(struct nouveau_ramht *ramht, int chid, u32 handle)
{
    u32 hash = 0;

    while (handle) {
        hash ^= (handle & ((1 << ramht->bits) - 1));
        handle >>= ramht->bits;
    }

    hash ^= chid << (ramht->bits - 4);
    hash  = hash << 3;
    return hash;
}

int
nouveau_ramht_insert(struct nouveau_ramht *ramht, int chid,
             u32 handle, u32 context)
{
    struct nouveau_bar *bar = nouveau_bar(ramht);
    u32 co, ho;

    co = ho = nouveau_ramht_hash(ramht, chid, handle);
    do {
        if (!nv_ro32(ramht, co + 4)) {
            nv_wo32(ramht, co + 0, handle);
            nv_wo32(ramht, co + 4, context);
            if (bar)
                bar->flush(bar);
            return co;
        }

        co += 8;
        if (co >= nv_gpuobj(ramht)->size)
            co = 0;
    } while (co != ho);

    return -ENOMEM;
}

void
nouveau_ramht_remove(struct nouveau_ramht *ramht, int cookie)
{
    struct nouveau_bar *bar = nouveau_bar(ramht);
    nv_wo32(ramht, cookie + 0, 0x00000000);
    nv_wo32(ramht, cookie + 4, 0x00000000);
    if (bar)
        bar->flush(bar);
}

static struct nouveau_oclass
nouveau_ramht_oclass = {
    .handle = 0x0000abcd,
    .ofuncs = &(struct nouveau_ofuncs) {
        .ctor = NULL,
        .dtor = _nouveau_gpuobj_dtor,
        .init = _nouveau_gpuobj_init,
        .fini = _nouveau_gpuobj_fini,
        .rd32 = _nouveau_gpuobj_rd32,
        .wr32 = _nouveau_gpuobj_wr32,
    },
};

int
nouveau_ramht_new(struct nouveau_object *parent, struct nouveau_object *pargpu,
          u32 size, u32 align, struct nouveau_ramht **pramht)
{
    struct nouveau_ramht *ramht;
    int ret;

    ret = nouveau_gpuobj_create(parent, parent->engine ?
                    parent->engine : parent, /* <nv50 ramht */
                    &nouveau_ramht_oclass, 0, pargpu, size,
                    align, NVOBJ_FLAG_ZERO_ALLOC, &ramht);
    *pramht = ramht;
    if (ret)
        return ret;

    ramht->bits = log2i(nv_gpuobj(ramht)->size >> 3);
    return 0;
}