/*
 * Copyright 2021 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 "chan.h"

#include <core/oproxy.h>
#include <core/ramht.h>

#include <nvif/if0014.h>

static int
nvkm_disp_chan_ntfy(struct nvkm_object *object, u32 type, struct nvkm_event **pevent)
{
        struct nvkm_disp_chan *chan = nvkm_disp_chan(object);
        struct nvkm_disp *disp = chan->disp;

        switch (type) {
        case 0:
                *pevent = &disp->uevent;
                return 0;
        default:
                break;
        }

        return -EINVAL;
}

static int
nvkm_disp_chan_map(struct nvkm_object *object, void *argv, u32 argc,
                   enum nvkm_object_map *type, u64 *addr, u64 *size)
{
        struct nvkm_disp_chan *chan = nvkm_disp_chan(object);
        struct nvkm_device *device = chan->disp->engine.subdev.device;
        const u64 base = device->func->resource_addr(device, NVKM_BAR0_PRI);

        *type = NVKM_OBJECT_MAP_IO;
        *addr = base + chan->func->user(chan, size);
        return 0;
}

struct nvkm_disp_chan_object {
        struct nvkm_oproxy oproxy;
        struct nvkm_disp *disp;
        int hash;
};

static void
nvkm_disp_chan_child_del_(struct nvkm_oproxy *base)
{
        struct nvkm_disp_chan_object *object = container_of(base, typeof(*object), oproxy);

        nvkm_ramht_remove(object->disp->ramht, object->hash);
}

static const struct nvkm_oproxy_func
nvkm_disp_chan_child_func_ = {
        .dtor[0] = nvkm_disp_chan_child_del_,
};

static int
nvkm_disp_chan_child_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
                         struct nvkm_object **pobject)
{
        struct nvkm_disp_chan *chan = nvkm_disp_chan(oclass->parent);
        struct nvkm_disp *disp = chan->disp;
        struct nvkm_device *device = disp->engine.subdev.device;
        const struct nvkm_device_oclass *sclass = oclass->priv;
        struct nvkm_disp_chan_object *object;
        int ret;

        if (!(object = kzalloc_obj(*object)))
                return -ENOMEM;
        nvkm_oproxy_ctor(&nvkm_disp_chan_child_func_, oclass, &object->oproxy);
        object->disp = disp;
        *pobject = &object->oproxy.base;

        ret = sclass->ctor(device, oclass, argv, argc, &object->oproxy.object);
        if (ret)
                return ret;

        object->hash = chan->func->bind(chan, object->oproxy.object, oclass->handle);
        if (object->hash < 0)
                return object->hash;

        return 0;
}

static int
nvkm_disp_chan_child_get(struct nvkm_object *object, int index, struct nvkm_oclass *sclass)
{
        struct nvkm_disp_chan *chan = nvkm_disp_chan(object);
        struct nvkm_device *device = chan->disp->engine.subdev.device;
        const struct nvkm_device_oclass *oclass = NULL;

        if (chan->func->bind)
                sclass->engine = nvkm_device_engine(device, NVKM_ENGINE_DMAOBJ, 0);
        else
                sclass->engine = NULL;

        if (sclass->engine && sclass->engine->func->base.sclass) {
                sclass->engine->func->base.sclass(sclass, index, &oclass);
                if (oclass) {
                        sclass->ctor = nvkm_disp_chan_child_new;
                        sclass->priv = oclass;
                        return 0;
                }
        }

        return -EINVAL;
}

static int
nvkm_disp_chan_fini(struct nvkm_object *object, enum nvkm_suspend_state suspend)
{
        struct nvkm_disp_chan *chan = nvkm_disp_chan(object);

        chan->func->fini(chan);
        chan->func->intr(chan, false);
        return 0;
}

static int
nvkm_disp_chan_init(struct nvkm_object *object)
{
        struct nvkm_disp_chan *chan = nvkm_disp_chan(object);

        chan->func->intr(chan, true);
        return chan->func->init(chan);
}

static void *
nvkm_disp_chan_dtor(struct nvkm_object *object)
{
        struct nvkm_disp_chan *chan = nvkm_disp_chan(object);
        struct nvkm_disp *disp = chan->disp;

        spin_lock(&disp->client.lock);
        if (disp->chan[chan->chid.user] == chan)
                disp->chan[chan->chid.user] = NULL;
        spin_unlock(&disp->client.lock);

        nvkm_memory_unref(&chan->memory);
        return chan;
}

static const struct nvkm_object_func
nvkm_disp_chan = {
        .dtor = nvkm_disp_chan_dtor,
        .init = nvkm_disp_chan_init,
        .fini = nvkm_disp_chan_fini,
        .ntfy = nvkm_disp_chan_ntfy,
        .map = nvkm_disp_chan_map,
        .sclass = nvkm_disp_chan_child_get,
};

static int
nvkm_disp_chan_new_(struct nvkm_disp *disp, int nr, const struct nvkm_oclass *oclass,
                    void *argv, u32 argc, struct nvkm_object **pobject)
{
        const struct nvkm_disp_chan_user *user = NULL;
        struct nvkm_disp_chan *chan;
        union nvif_disp_chan_args *args = argv;
        int ret, i;

        for (i = 0; disp->func->user[i].ctor; i++) {
                if (disp->func->user[i].base.oclass == oclass->base.oclass) {
                        user = disp->func->user[i].chan;
                        break;
                }
        }

        if (WARN_ON(!user))
                return -EINVAL;

        if (argc != sizeof(args->v0) || args->v0.version != 0)
                return -ENOSYS;
        if (args->v0.id >= nr || !args->v0.pushbuf != !user->func->push)
                return -EINVAL;

        if (!(chan = kzalloc_obj(*chan)))
                return -ENOMEM;
        *pobject = &chan->object;

        nvkm_object_ctor(&nvkm_disp_chan, oclass, &chan->object);
        chan->func = user->func;
        chan->mthd = user->mthd;
        chan->disp = disp;
        chan->chid.ctrl = user->ctrl + args->v0.id;
        chan->chid.user = user->user + args->v0.id;
        chan->head = args->v0.id;

        if (chan->func->push) {
                ret = chan->func->push(chan, args->v0.pushbuf);
                if (ret)
                        return ret;
        }

        spin_lock(&disp->client.lock);
        if (disp->chan[chan->chid.user]) {
                spin_unlock(&disp->client.lock);
                return -EBUSY;
        }
        disp->chan[chan->chid.user] = chan;
        spin_unlock(&disp->client.lock);
        return 0;
}

int
nvkm_disp_wndw_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
                   struct nvkm_object **pobject)
{
        struct nvkm_disp *disp = nvkm_udisp(oclass->parent);

        return nvkm_disp_chan_new_(disp, disp->wndw.nr, oclass, argv, argc, pobject);
}

int
nvkm_disp_chan_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
                   struct nvkm_object **pobject)
{
        struct nvkm_disp *disp = nvkm_udisp(oclass->parent);

        return nvkm_disp_chan_new_(disp, disp->head.nr, oclass, argv, argc, pobject);
}

int
nvkm_disp_core_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
                   struct nvkm_object **pobject)
{
        struct nvkm_disp *disp = nvkm_udisp(oclass->parent);

        return nvkm_disp_chan_new_(disp, 1, oclass, argv, argc, pobject);
}