linux_kernel/drivers/gpu/drm/nouveau/nvkm/engine/sw/base.c

/*
 * Copyright 2015 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 <bskeggs@redhat.com>
 */
#include "priv.h"
#include "chan.h"

#include <engine/fifo.h>

bool
nvkm_sw_mthd(struct nvkm_sw *sw, int chid, int subc, u32 mthd, u32 data)
{
	struct nvkm_sw_chan *chan;
	bool handled = false;
	unsigned long flags;

	spin_lock_irqsave(&sw->engine.lock, flags);
	list_for_each_entry(chan, &sw->chan, head) {
		if (chan->fifo->chid == chid) {
			handled = nvkm_sw_chan_mthd(chan, subc, mthd, data);
			list_del(&chan->head);
			list_add(&chan->head, &sw->chan);
			break;
		}
	}
	spin_unlock_irqrestore(&sw->engine.lock, flags);
	return handled;
}

static int
nvkm_sw_oclass_new(const struct nvkm_oclass *oclass, void *data, u32 size,
		   struct nvkm_object **pobject)
{
	struct nvkm_sw_chan *chan = nvkm_sw_chan(oclass->parent);
	const struct nvkm_sw_chan_sclass *sclass = oclass->engn;
	return sclass->ctor(chan, oclass, data, size, pobject);
}

static int
nvkm_sw_oclass_get(struct nvkm_oclass *oclass, int index)
{
	struct nvkm_sw *sw = nvkm_sw(oclass->engine);
	int c = 0;

	while (sw->func->sclass[c].ctor) {
		if (c++ == index) {
			oclass->engn = &sw->func->sclass[index];
			oclass->base =  sw->func->sclass[index].base;
			oclass->base.ctor = nvkm_sw_oclass_new;
			return index;
		}
	}

	return c;
}

static int
nvkm_sw_cclass_get(struct nvkm_fifo_chan *fifoch,
		   const struct nvkm_oclass *oclass,
		   struct nvkm_object **pobject)
{
	struct nvkm_sw *sw = nvkm_sw(oclass->engine);
	return sw->func->chan_new(sw, fifoch, oclass, pobject);
}

static void *
nvkm_sw_dtor(struct nvkm_engine *engine)
{
	return nvkm_sw(engine);
}

static const struct nvkm_engine_func
nvkm_sw = {
	.dtor = nvkm_sw_dtor,
	.fifo.cclass = nvkm_sw_cclass_get,
	.fifo.sclass = nvkm_sw_oclass_get,
};

int
nvkm_sw_new_(const struct nvkm_sw_func *func, struct nvkm_device *device,
	     int index, struct nvkm_sw **psw)
{
	struct nvkm_sw *sw;

	if (!(sw = *psw = kzalloc(sizeof(*sw), GFP_KERNEL)))
		return -ENOMEM;
	INIT_LIST_HEAD(&sw->chan);
	sw->func = func;

	return nvkm_engine_ctor(&nvkm_sw, device, index, true, &sw->engine);
}