drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogk104.c - platform/hardware/bsp/kernel/common/v4.4 - Git at Google

 /*
  * 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 "changk104.h"

 #include <core/client.h>
 #include <core/gpuobj.h>
 #include <subdev/fb.h>
 #include <subdev/mmu.h>
 #include <subdev/timer.h>

 #include <nvif/class.h>
 #include <nvif/unpack.h>

 static int
 gk104_fifo_gpfifo_kick(struct gk104_fifo_chan *chan)
 {
 	struct gk104_fifo *fifo = chan->fifo;
 	struct nvkm_subdev *subdev = &fifo->base.engine.subdev;
 	struct nvkm_device *device = subdev->device;
 	struct nvkm_client *client = chan->base.object.client;
 	int ret = 0;

 	mutex_lock(&subdev->mutex);
 	nvkm_wr32(device, 0x002634, chan->base.chid);
 	if (nvkm_msec(device, 2000,
 		if (!(nvkm_rd32(device, 0x002634) & 0x00100000))
 			break;
 	) < 0) {
 		nvkm_error(subdev, "channel %d [%s] kick timeout\n",
 			   chan->base.chid, client->name);
 		ret = -ETIMEDOUT;
 	}
 	mutex_unlock(&subdev->mutex);
 	return ret;
 }

 static u32
 gk104_fifo_gpfifo_engine_addr(struct nvkm_engine *engine)
 {
 	switch (engine->subdev.index) {
 	case NVKM_ENGINE_SW    :
 	case NVKM_ENGINE_CE0   :
 	case NVKM_ENGINE_CE1   :
 	case NVKM_ENGINE_CE2   : return 0x0000;
 	case NVKM_ENGINE_GR    : return 0x0210;
 	case NVKM_ENGINE_MSPDEC: return 0x0250;
 	case NVKM_ENGINE_MSPPP : return 0x0260;
 	case NVKM_ENGINE_MSVLD : return 0x0270;
 	default:
 		WARN_ON(1);
 		return 0;
 	}
 }

 static int
 gk104_fifo_gpfifo_engine_fini(struct nvkm_fifo_chan *base,
 			      struct nvkm_engine *engine, bool suspend)
 {
 	const u32 offset = gk104_fifo_gpfifo_engine_addr(engine);
 	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
 	struct nvkm_gpuobj *inst = chan->base.inst;
 	int ret;

 	ret = gk104_fifo_gpfifo_kick(chan);
 	if (ret && suspend)
 		return ret;

 	if (offset) {
 		nvkm_kmap(inst);
 		nvkm_wo32(inst, offset + 0x00, 0x00000000);
 		nvkm_wo32(inst, offset + 0x04, 0x00000000);
 		nvkm_done(inst);
 	}

 	return ret;
 }

 static int
 gk104_fifo_gpfifo_engine_init(struct nvkm_fifo_chan *base,
 			      struct nvkm_engine *engine)
 {
 	const u32 offset = gk104_fifo_gpfifo_engine_addr(engine);
 	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
 	struct nvkm_gpuobj *inst = chan->base.inst;

 	if (offset) {
 		u64 addr = chan->engn[engine->subdev.index].vma.offset;
 		nvkm_kmap(inst);
 		nvkm_wo32(inst, offset + 0x00, lower_32_bits(addr) | 4);
 		nvkm_wo32(inst, offset + 0x04, upper_32_bits(addr));
 		nvkm_done(inst);
 	}

 	return 0;
 }

 static void
 gk104_fifo_gpfifo_engine_dtor(struct nvkm_fifo_chan *base,
 			      struct nvkm_engine *engine)
 {
 	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
 	nvkm_gpuobj_unmap(&chan->engn[engine->subdev.index].vma);
 	nvkm_gpuobj_del(&chan->engn[engine->subdev.index].inst);
 }

 static int
 gk104_fifo_gpfifo_engine_ctor(struct nvkm_fifo_chan *base,
 			      struct nvkm_engine *engine,
 			      struct nvkm_object *object)
 {
 	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
 	int engn = engine->subdev.index;
 	int ret;

 	if (!gk104_fifo_gpfifo_engine_addr(engine))
 		return 0;

 	ret = nvkm_object_bind(object, NULL, 0, &chan->engn[engn].inst);
 	if (ret)
 		return ret;

 	return nvkm_gpuobj_map(chan->engn[engn].inst, chan->vm,
 			       NV_MEM_ACCESS_RW, &chan->engn[engn].vma);
 }

 static void
 gk104_fifo_gpfifo_fini(struct nvkm_fifo_chan *base)
 {
 	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
 	struct gk104_fifo *fifo = chan->fifo;
 	struct nvkm_device *device = fifo->base.engine.subdev.device;
 	u32 coff = chan->base.chid * 8;

 	if (!list_empty(&chan->head)) {
 		list_del_init(&chan->head);
 		nvkm_mask(device, 0x800004 + coff, 0x00000800, 0x00000800);
 		gk104_fifo_runlist_update(fifo, chan->engine);
 	}

 	nvkm_wr32(device, 0x800000 + coff, 0x00000000);
 }

 static void
 gk104_fifo_gpfifo_init(struct nvkm_fifo_chan *base)
 {
 	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
 	struct gk104_fifo *fifo = chan->fifo;
 	struct nvkm_device *device = fifo->base.engine.subdev.device;
 	u32 addr = chan->base.inst->addr >> 12;
 	u32 coff = chan->base.chid * 8;

 	nvkm_mask(device, 0x800004 + coff, 0x000f0000, chan->engine << 16);
 	nvkm_wr32(device, 0x800000 + coff, 0x80000000 | addr);

 	if (list_empty(&chan->head) && !chan->killed) {
 		list_add_tail(&chan->head, &fifo->engine[chan->engine].chan);
 		nvkm_mask(device, 0x800004 + coff, 0x00000400, 0x00000400);
 		gk104_fifo_runlist_update(fifo, chan->engine);
 		nvkm_mask(device, 0x800004 + coff, 0x00000400, 0x00000400);
 	}
 }

 static void *
 gk104_fifo_gpfifo_dtor(struct nvkm_fifo_chan *base)
 {
 	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
 	nvkm_vm_ref(NULL, &chan->vm, chan->pgd);
 	nvkm_gpuobj_del(&chan->pgd);
 	return chan;
 }

 static const struct nvkm_fifo_chan_func
 gk104_fifo_gpfifo_func = {
 	.dtor = gk104_fifo_gpfifo_dtor,
 	.init = gk104_fifo_gpfifo_init,
 	.fini = gk104_fifo_gpfifo_fini,
 	.ntfy = g84_fifo_chan_ntfy,
 	.engine_ctor = gk104_fifo_gpfifo_engine_ctor,
 	.engine_dtor = gk104_fifo_gpfifo_engine_dtor,
 	.engine_init = gk104_fifo_gpfifo_engine_init,
 	.engine_fini = gk104_fifo_gpfifo_engine_fini,
 };

 int
 gk104_fifo_gpfifo_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 		      void *data, u32 size, struct nvkm_object **pobject)
 {
 	union {
 		struct kepler_channel_gpfifo_a_v0 v0;
 	} *args = data;
 	struct gk104_fifo *fifo = gk104_fifo(base);
 	struct nvkm_device *device = fifo->base.engine.subdev.device;
 	struct nvkm_object *parent = oclass->parent;
 	struct gk104_fifo_chan *chan;
 	u64 usermem, ioffset, ilength;
 	u32 engines;
 	int ret, i;

 	nvif_ioctl(parent, "create channel gpfifo size %d\n", size);
 	if (nvif_unpack(args->v0, 0, 0, false)) {
 		nvif_ioctl(parent, "create channel gpfifo vers %d vm %llx "
 				   "ioffset %016llx ilength %08x engine %08x\n",
 			   args->v0.version, args->v0.vm, args->v0.ioffset,
 			   args->v0.ilength, args->v0.engine);
 	} else
 		return ret;

 	/* determine which downstream engines are present */
 	for (i = 0, engines = 0; i < ARRAY_SIZE(fifo->engine); i++) {
 		u64 subdevs = gk104_fifo_engine_subdev(i);
 		if (!nvkm_device_engine(device, __ffs64(subdevs)))
 			continue;
 		engines |= (1 << i);
 	}

 	/* if this is an engine mask query, we're done */
 	if (!args->v0.engine) {
 		args->v0.engine = engines;
 		return nvkm_object_new(oclass, NULL, 0, pobject);
 	}

 	/* check that we support a requested engine - note that the user
 	 * argument is a mask in order to allow the user to request (for
 	 * example) *any* copy engine, but doesn't matter which.
 	 */
 	args->v0.engine &= engines;
 	if (!args->v0.engine) {
 		nvif_ioctl(parent, "no supported engine\n");
 		return -ENODEV;
 	}

 	/* allocate the channel */
 	if (!(chan = kzalloc(sizeof(*chan), GFP_KERNEL)))
 		return -ENOMEM;
 	*pobject = &chan->base.object;
 	chan->fifo = fifo;
 	chan->engine = __ffs(args->v0.engine);
 	INIT_LIST_HEAD(&chan->head);

 	ret = nvkm_fifo_chan_ctor(&gk104_fifo_gpfifo_func, &fifo->base,
 				  0x1000, 0x1000, true, args->v0.vm, 0,
 				  gk104_fifo_engine_subdev(chan->engine),
 				  1, fifo->user.bar.offset, 0x200,
 				  oclass, &chan->base);
 	if (ret)
 		return ret;

 	args->v0.chid = chan->base.chid;

 	/* page directory */
 	ret = nvkm_gpuobj_new(device, 0x10000, 0x1000, false, NULL, &chan->pgd);
 	if (ret)
 		return ret;

 	nvkm_kmap(chan->base.inst);
 	nvkm_wo32(chan->base.inst, 0x0200, lower_32_bits(chan->pgd->addr));
 	nvkm_wo32(chan->base.inst, 0x0204, upper_32_bits(chan->pgd->addr));
 	nvkm_wo32(chan->base.inst, 0x0208, 0xffffffff);
 	nvkm_wo32(chan->base.inst, 0x020c, 0x000000ff);
 	nvkm_done(chan->base.inst);

 	ret = nvkm_vm_ref(chan->base.vm, &chan->vm, chan->pgd);
 	if (ret)
 		return ret;

 	/* clear channel control registers */
 	usermem = chan->base.chid * 0x200;
 	ioffset = args->v0.ioffset;
 	ilength = order_base_2(args->v0.ilength / 8);

 	nvkm_kmap(fifo->user.mem);
 	for (i = 0; i < 0x200; i += 4)
 		nvkm_wo32(fifo->user.mem, usermem + i, 0x00000000);
 	nvkm_done(fifo->user.mem);
 	usermem = nvkm_memory_addr(fifo->user.mem) + usermem;

 	/* RAMFC */
 	nvkm_kmap(chan->base.inst);
 	nvkm_wo32(chan->base.inst, 0x08, lower_32_bits(usermem));
 	nvkm_wo32(chan->base.inst, 0x0c, upper_32_bits(usermem));
 	nvkm_wo32(chan->base.inst, 0x10, 0x0000face);
 	nvkm_wo32(chan->base.inst, 0x30, 0xfffff902);
 	nvkm_wo32(chan->base.inst, 0x48, lower_32_bits(ioffset));
 	nvkm_wo32(chan->base.inst, 0x4c, upper_32_bits(ioffset) |
 					 (ilength << 16));
 	nvkm_wo32(chan->base.inst, 0x84, 0x20400000);
 	nvkm_wo32(chan->base.inst, 0x94, 0x30000001);
 	nvkm_wo32(chan->base.inst, 0x9c, 0x00000100);
 	nvkm_wo32(chan->base.inst, 0xac, 0x0000001f);
 	nvkm_wo32(chan->base.inst, 0xe8, chan->base.chid);
 	nvkm_wo32(chan->base.inst, 0xb8, 0xf8000000);
 	nvkm_wo32(chan->base.inst, 0xf8, 0x10003080); /* 0x002310 */
 	nvkm_wo32(chan->base.inst, 0xfc, 0x10000010); /* 0x002350 */
 	nvkm_done(chan->base.inst);
 	return 0;
 }

 const struct nvkm_fifo_chan_oclass
 gk104_fifo_gpfifo_oclass = {
 	.base.oclass = KEPLER_CHANNEL_GPFIFO_A,
 	.base.minver = 0,
 	.base.maxver = 0,
 	.ctor = gk104_fifo_gpfifo_new,
 };
	/*
	* 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 "changk104.h"

	#include <core/client.h>
	#include <core/gpuobj.h>
	#include <subdev/fb.h>
	#include <subdev/mmu.h>
	#include <subdev/timer.h>

	#include <nvif/class.h>
	#include <nvif/unpack.h>

	static int
	gk104_fifo_gpfifo_kick(struct gk104_fifo_chan *chan)
	{
	struct gk104_fifo *fifo = chan->fifo;
	struct nvkm_subdev *subdev = &fifo->base.engine.subdev;
	struct nvkm_device *device = subdev->device;
	struct nvkm_client *client = chan->base.object.client;
	int ret = 0;

	mutex_lock(&subdev->mutex);
	nvkm_wr32(device, 0x002634, chan->base.chid);
	if (nvkm_msec(device, 2000,
	if (!(nvkm_rd32(device, 0x002634) & 0x00100000))
	break;
	) < 0) {
	nvkm_error(subdev, "channel %d [%s] kick timeout\n",
	chan->base.chid, client->name);
	ret = -ETIMEDOUT;
	}
	mutex_unlock(&subdev->mutex);
	return ret;
	}

	static u32
	gk104_fifo_gpfifo_engine_addr(struct nvkm_engine *engine)
	{
	switch (engine->subdev.index) {
	case NVKM_ENGINE_SW :
	case NVKM_ENGINE_CE0 :
	case NVKM_ENGINE_CE1 :
	case NVKM_ENGINE_CE2 : return 0x0000;
	case NVKM_ENGINE_GR : return 0x0210;
	case NVKM_ENGINE_MSPDEC: return 0x0250;
	case NVKM_ENGINE_MSPPP : return 0x0260;
	case NVKM_ENGINE_MSVLD : return 0x0270;
	default:
	WARN_ON(1);
	return 0;
	}
	}

	static int
	gk104_fifo_gpfifo_engine_fini(struct nvkm_fifo_chan *base,
	struct nvkm_engine *engine, bool suspend)
	{
	const u32 offset = gk104_fifo_gpfifo_engine_addr(engine);
	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
	struct nvkm_gpuobj *inst = chan->base.inst;
	int ret;

	ret = gk104_fifo_gpfifo_kick(chan);
	if (ret && suspend)
	return ret;

	if (offset) {
	nvkm_kmap(inst);
	nvkm_wo32(inst, offset + 0x00, 0x00000000);
	nvkm_wo32(inst, offset + 0x04, 0x00000000);
	nvkm_done(inst);
	}

	return ret;
	}

	static int
	gk104_fifo_gpfifo_engine_init(struct nvkm_fifo_chan *base,
	struct nvkm_engine *engine)
	{
	const u32 offset = gk104_fifo_gpfifo_engine_addr(engine);
	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
	struct nvkm_gpuobj *inst = chan->base.inst;

	if (offset) {
	u64 addr = chan->engn[engine->subdev.index].vma.offset;
	nvkm_kmap(inst);
	nvkm_wo32(inst, offset + 0x00, lower_32_bits(addr) \| 4);
	nvkm_wo32(inst, offset + 0x04, upper_32_bits(addr));
	nvkm_done(inst);
	}

	return 0;
	}

	static void
	gk104_fifo_gpfifo_engine_dtor(struct nvkm_fifo_chan *base,
	struct nvkm_engine *engine)
	{
	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
	nvkm_gpuobj_unmap(&chan->engn[engine->subdev.index].vma);
	nvkm_gpuobj_del(&chan->engn[engine->subdev.index].inst);
	}

	static int
	gk104_fifo_gpfifo_engine_ctor(struct nvkm_fifo_chan *base,
	struct nvkm_engine *engine,
	struct nvkm_object *object)
	{
	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
	int engn = engine->subdev.index;
	int ret;

	if (!gk104_fifo_gpfifo_engine_addr(engine))
	return 0;

	ret = nvkm_object_bind(object, NULL, 0, &chan->engn[engn].inst);
	if (ret)
	return ret;

	return nvkm_gpuobj_map(chan->engn[engn].inst, chan->vm,
	NV_MEM_ACCESS_RW, &chan->engn[engn].vma);
	}

	static void
	gk104_fifo_gpfifo_fini(struct nvkm_fifo_chan *base)
	{
	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
	struct gk104_fifo *fifo = chan->fifo;
	struct nvkm_device *device = fifo->base.engine.subdev.device;
	u32 coff = chan->base.chid * 8;

	if (!list_empty(&chan->head)) {
	list_del_init(&chan->head);
	nvkm_mask(device, 0x800004 + coff, 0x00000800, 0x00000800);
	gk104_fifo_runlist_update(fifo, chan->engine);
	}

	nvkm_wr32(device, 0x800000 + coff, 0x00000000);
	}

	static void
	gk104_fifo_gpfifo_init(struct nvkm_fifo_chan *base)
	{
	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
	struct gk104_fifo *fifo = chan->fifo;
	struct nvkm_device *device = fifo->base.engine.subdev.device;
	u32 addr = chan->base.inst->addr >> 12;
	u32 coff = chan->base.chid * 8;

	nvkm_mask(device, 0x800004 + coff, 0x000f0000, chan->engine << 16);
	nvkm_wr32(device, 0x800000 + coff, 0x80000000 \| addr);

	if (list_empty(&chan->head) && !chan->killed) {
	list_add_tail(&chan->head, &fifo->engine[chan->engine].chan);
	nvkm_mask(device, 0x800004 + coff, 0x00000400, 0x00000400);
	gk104_fifo_runlist_update(fifo, chan->engine);
	nvkm_mask(device, 0x800004 + coff, 0x00000400, 0x00000400);
	}
	}

	static void *
	gk104_fifo_gpfifo_dtor(struct nvkm_fifo_chan *base)
	{
	struct gk104_fifo_chan *chan = gk104_fifo_chan(base);
	nvkm_vm_ref(NULL, &chan->vm, chan->pgd);
	nvkm_gpuobj_del(&chan->pgd);
	return chan;
	}

	static const struct nvkm_fifo_chan_func
	gk104_fifo_gpfifo_func = {
	.dtor = gk104_fifo_gpfifo_dtor,
	.init = gk104_fifo_gpfifo_init,
	.fini = gk104_fifo_gpfifo_fini,
	.ntfy = g84_fifo_chan_ntfy,
	.engine_ctor = gk104_fifo_gpfifo_engine_ctor,
	.engine_dtor = gk104_fifo_gpfifo_engine_dtor,
	.engine_init = gk104_fifo_gpfifo_engine_init,
	.engine_fini = gk104_fifo_gpfifo_engine_fini,
	};

	int
	gk104_fifo_gpfifo_new(struct nvkm_fifo base, const struct nvkm_oclass oclass,
	void data, u32 size, struct nvkm_object *pobject)
	{
	union {
	struct kepler_channel_gpfifo_a_v0 v0;
	} *args = data;
	struct gk104_fifo *fifo = gk104_fifo(base);
	struct nvkm_device *device = fifo->base.engine.subdev.device;
	struct nvkm_object *parent = oclass->parent;
	struct gk104_fifo_chan *chan;
	u64 usermem, ioffset, ilength;
	u32 engines;
	int ret, i;

	nvif_ioctl(parent, "create channel gpfifo size %d\n", size);
	if (nvif_unpack(args->v0, 0, 0, false)) {
	nvif_ioctl(parent, "create channel gpfifo vers %d vm %llx "
	"ioffset %016llx ilength %08x engine %08x\n",
	args->v0.version, args->v0.vm, args->v0.ioffset,
	args->v0.ilength, args->v0.engine);
	} else
	return ret;

	/* determine which downstream engines are present */
	for (i = 0, engines = 0; i < ARRAY_SIZE(fifo->engine); i++) {
	u64 subdevs = gk104_fifo_engine_subdev(i);
	if (!nvkm_device_engine(device, __ffs64(subdevs)))
	continue;
	engines \|= (1 << i);
	}

	/* if this is an engine mask query, we're done */
	if (!args->v0.engine) {
	args->v0.engine = engines;
	return nvkm_object_new(oclass, NULL, 0, pobject);
	}

	/* check that we support a requested engine - note that the user
	* argument is a mask in order to allow the user to request (for
	* example) any copy engine, but doesn't matter which.
	*/
	args->v0.engine &= engines;
	if (!args->v0.engine) {
	nvif_ioctl(parent, "no supported engine\n");
	return -ENODEV;
	}

	/* allocate the channel */
	if (!(chan = kzalloc(sizeof(*chan), GFP_KERNEL)))
	return -ENOMEM;
	*pobject = &chan->base.object;
	chan->fifo = fifo;
	chan->engine = __ffs(args->v0.engine);
	INIT_LIST_HEAD(&chan->head);

	ret = nvkm_fifo_chan_ctor(&gk104_fifo_gpfifo_func, &fifo->base,
	0x1000, 0x1000, true, args->v0.vm, 0,
	gk104_fifo_engine_subdev(chan->engine),
	1, fifo->user.bar.offset, 0x200,
	oclass, &chan->base);
	if (ret)
	return ret;

	args->v0.chid = chan->base.chid;

	/* page directory */
	ret = nvkm_gpuobj_new(device, 0x10000, 0x1000, false, NULL, &chan->pgd);
	if (ret)
	return ret;

	nvkm_kmap(chan->base.inst);
	nvkm_wo32(chan->base.inst, 0x0200, lower_32_bits(chan->pgd->addr));
	nvkm_wo32(chan->base.inst, 0x0204, upper_32_bits(chan->pgd->addr));
	nvkm_wo32(chan->base.inst, 0x0208, 0xffffffff);
	nvkm_wo32(chan->base.inst, 0x020c, 0x000000ff);
	nvkm_done(chan->base.inst);

	ret = nvkm_vm_ref(chan->base.vm, &chan->vm, chan->pgd);
	if (ret)
	return ret;

	/* clear channel control registers */
	usermem = chan->base.chid * 0x200;
	ioffset = args->v0.ioffset;
	ilength = order_base_2(args->v0.ilength / 8);

	nvkm_kmap(fifo->user.mem);
	for (i = 0; i < 0x200; i += 4)
	nvkm_wo32(fifo->user.mem, usermem + i, 0x00000000);
	nvkm_done(fifo->user.mem);
	usermem = nvkm_memory_addr(fifo->user.mem) + usermem;

	/* RAMFC */
	nvkm_kmap(chan->base.inst);
	nvkm_wo32(chan->base.inst, 0x08, lower_32_bits(usermem));
	nvkm_wo32(chan->base.inst, 0x0c, upper_32_bits(usermem));
	nvkm_wo32(chan->base.inst, 0x10, 0x0000face);
	nvkm_wo32(chan->base.inst, 0x30, 0xfffff902);
	nvkm_wo32(chan->base.inst, 0x48, lower_32_bits(ioffset));
	nvkm_wo32(chan->base.inst, 0x4c, upper_32_bits(ioffset) \|
	(ilength << 16));
	nvkm_wo32(chan->base.inst, 0x84, 0x20400000);
	nvkm_wo32(chan->base.inst, 0x94, 0x30000001);
	nvkm_wo32(chan->base.inst, 0x9c, 0x00000100);
	nvkm_wo32(chan->base.inst, 0xac, 0x0000001f);
	nvkm_wo32(chan->base.inst, 0xe8, chan->base.chid);
	nvkm_wo32(chan->base.inst, 0xb8, 0xf8000000);
	nvkm_wo32(chan->base.inst, 0xf8, 0x10003080); /* 0x002310 */
	nvkm_wo32(chan->base.inst, 0xfc, 0x10000010); /* 0x002350 */
	nvkm_done(chan->base.inst);
	return 0;
	}

	const struct nvkm_fifo_chan_oclass
	gk104_fifo_gpfifo_oclass = {
	.base.oclass = KEPLER_CHANNEL_GPFIFO_A,
	.base.minver = 0,
	.base.maxver = 0,
	.ctor = gk104_fifo_gpfifo_new,
	};